diff --git a/RegistrationOfPatients/RegistrationOfPatients/Entities/Doctor.cs b/RegistrationOfPatients/RegistrationOfPatients/Entities/Doctor.cs
new file mode 100644
index 0000000..574abfc
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Entities/Doctor.cs
@@ -0,0 +1,16 @@
+namespace RegistrationOfPatients.Entities;
+
+public class Doctor
+{
+    public int Id { get; private set; }
+    public string Name { get; private set; } = string.Empty;
+
+    public static Doctor CreateEntity(int id, string name)
+    {
+        return new Doctor
+        {
+            Id = id,
+            Name = name
+        };
+    }
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Entities/DoctorPatient.cs b/RegistrationOfPatients/RegistrationOfPatients/Entities/DoctorPatient.cs
new file mode 100644
index 0000000..76a37cb
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Entities/DoctorPatient.cs
@@ -0,0 +1,21 @@
+namespace RegistrationOfPatients.Entities;
+
+public class DoctorPatient
+{
+    public int Id { get; private set; }
+    public int PatientId { get; private set; }
+    public int DoctorId { get; private set; }
+    public DateTime DateStart { get; private set; }
+    public DateTime? DateStop { get; private set; }
+    public static DoctorPatient CreateElement(int id, int patientId, int doctorId, DateTime? dateStop = null)
+    {
+        return new DoctorPatient
+        {
+            Id = id,
+            PatientId = patientId,
+            DoctorId = doctorId,
+            DateStart = DateTime.Now,
+            DateStop = dateStop
+        };
+    }
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Entities/Enums/HealthStatus.cs b/RegistrationOfPatients/RegistrationOfPatients/Entities/Enums/HealthStatus.cs
new file mode 100644
index 0000000..ca07025
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Entities/Enums/HealthStatus.cs
@@ -0,0 +1,7 @@
+namespace RegistrationOfPatients.Entities.Enums;
+
+public enum HealthStatus
+{
+    Ill = 0,
+    Healthy = 1
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Entities/Patient.cs b/RegistrationOfPatients/RegistrationOfPatients/Entities/Patient.cs
new file mode 100644
index 0000000..315d68e
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Entities/Patient.cs
@@ -0,0 +1,17 @@
+namespace RegistrationOfPatients.Entities;
+
+public class Patient
+{
+    public int Id { get; private set; }
+    public string Name { get; private set; } = string.Empty;
+    public string Phone { get; private set; } = string.Empty;
+    public static Patient CreateEntity(int id, string Name, string Phone)
+    {
+        return new Patient
+        {
+            Id = id,
+            Name = Name ?? string.Empty,
+            Phone = Phone ?? string.Empty
+        };
+    }
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Entities/Payment.cs b/RegistrationOfPatients/RegistrationOfPatients/Entities/Payment.cs
new file mode 100644
index 0000000..f659723
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Entities/Payment.cs
@@ -0,0 +1,23 @@
+namespace RegistrationOfPatients.Entities;
+
+public class Payment
+{
+    public int Id { get; private set; }
+    public int Salary { get; private set; }
+    public int TotalPatients { get; private set; }
+    public DateTime Date { get; private set; }
+    public int PercentageOfRecoveries { get; private set; }
+    public int DoctorId { get; private set; }
+    public static Payment CreateOperation(int id, int salary, int totalPatients, int percentageOfRecoveries, int doctorId)
+    {
+        return new Payment
+        {
+            Id = id,
+            Salary = salary,
+            TotalPatients = totalPatients,
+            Date = DateTime.Now,
+            PercentageOfRecoveries = percentageOfRecoveries,
+            DoctorId = doctorId
+        };
+    }
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Entities/Reception.cs b/RegistrationOfPatients/RegistrationOfPatients/Entities/Reception.cs
new file mode 100644
index 0000000..f865805
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Entities/Reception.cs
@@ -0,0 +1,25 @@
+using RegistrationOfPatients.Entities.Enums;
+
+namespace RegistrationOfPatients.Entities;
+
+public class Reception
+{
+    public int Id { get; private set; }
+    public DateTime Date { get; private set; }
+    public HealthStatus HealthStatus { get; private set; }
+    public string Illness { get; private set; } = string.Empty;
+    public int PatientId { get; private set; }
+    public int DoctorId { get; private set; }
+    public static Reception CreateOperation(int id, HealthStatus healthStatus, string illness, int patientId, int doctorId)
+    {
+        return new Reception
+        {
+            Id = id,
+            Date = DateTime.Now,
+            HealthStatus = healthStatus,
+            Illness = illness ?? string.Empty,
+            PatientId = patientId,
+            DoctorId = doctorId
+        };
+    }
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Repositories/IDoctorRepository.cs b/RegistrationOfPatients/RegistrationOfPatients/Repositories/IDoctorRepository.cs
new file mode 100644
index 0000000..328b078
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Repositories/IDoctorRepository.cs
@@ -0,0 +1,21 @@
+using RegistrationOfPatients.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RegistrationOfPatients.Repositories;
+
+public interface IDoctorRepository
+{
+    IEnumerable<Doctor> ReadDoctor();
+
+    Doctor ReadDoctorById(int id);
+
+    void CreateDoctor(Doctor doctor);
+
+    void UpdateDoctor(Doctor doctor);
+
+    void DeleteDoctor(int id);
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Repositories/IPatientRepository.cs b/RegistrationOfPatients/RegistrationOfPatients/Repositories/IPatientRepository.cs
new file mode 100644
index 0000000..373b793
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Repositories/IPatientRepository.cs
@@ -0,0 +1,16 @@
+using RegistrationOfPatients.Entities;
+
+namespace RegistrationOfPatients.Repositories;
+
+public interface IPatientRepository
+{
+    IEnumerable<Patient> ReadPatient();
+
+    Patient ReadPatientById(int id);
+
+    void CreatePatient(Patient patient);
+
+    void UpdatePatient(Patient patient);
+
+    void DeletePatient(int id);
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Repositories/IPaymentRepository.cs b/RegistrationOfPatients/RegistrationOfPatients/Repositories/IPaymentRepository.cs
new file mode 100644
index 0000000..2d12838
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Repositories/IPaymentRepository.cs
@@ -0,0 +1,17 @@
+using RegistrationOfPatients.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RegistrationOfPatients.Repositories;
+
+public interface IPaymentRepository
+{
+    IEnumerable<Payment> ReadPayment(DateTime? dateForm = null, DateTime? dateTo = null, int? doctorId = null);
+
+    void CreateReception(Payment payment);
+
+    void DeletePayment(int id);
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Repositories/IReceptionRepository.cs b/RegistrationOfPatients/RegistrationOfPatients/Repositories/IReceptionRepository.cs
new file mode 100644
index 0000000..9868442
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Repositories/IReceptionRepository.cs
@@ -0,0 +1,10 @@
+using RegistrationOfPatients.Entities;
+
+namespace RegistrationOfPatients.Repositories;
+
+public interface IReceptionRepository
+{
+    IEnumerable<Reception> ReadReception(DateTime? dateForm = null, DateTime? dateTo = null, int? doctorId = null, int? patientId = null);
+
+    void CreateReception(Reception reception);
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/DoctorRepository.cs b/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/DoctorRepository.cs
new file mode 100644
index 0000000..ec81141
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/DoctorRepository.cs
@@ -0,0 +1,36 @@
+using RegistrationOfPatients.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RegistrationOfPatients.Repositories.Implementations;
+
+public class DoctorRepository : IDoctorRepository
+{
+    public void CreateDoctor(Doctor doctor)
+    {
+
+    }
+
+    public void DeleteDoctor(int id)
+    {
+
+    }
+
+    public IEnumerable<Doctor> ReadDoctor()
+    {
+        return Enumerable.Empty<Doctor>();
+    }
+
+    public Doctor ReadDoctorById(int id)
+    {
+        return Doctor.CreateEntity(0, string.Empty);
+    }
+
+    public void UpdateDoctor(Doctor doctor)
+    {
+
+    }
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/PatientRepository.cs b/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/PatientRepository.cs
new file mode 100644
index 0000000..caf5f45
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/PatientRepository.cs
@@ -0,0 +1,36 @@
+using RegistrationOfPatients.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RegistrationOfPatients.Repositories.Implementations;
+
+internal class PatientRepository : IPatientRepository
+{
+    public void CreatePatient(Patient patient)
+    {
+        
+    }
+
+    public void DeletePatient(int id)
+    {
+        
+    }
+
+    public IEnumerable<Patient> ReadPatient()
+    {
+        return Enumerable.Empty<Patient>();
+    }
+
+    public Patient ReadPatientById(int id)
+    {
+        return Patient.CreateEntity(0, string.Empty, string.Empty);
+    }
+
+    public void UpdatePatient(Patient patient)
+    {
+        
+    }
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/PaymentRepository.cs b/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/PaymentRepository.cs
new file mode 100644
index 0000000..8e7ba5a
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/PaymentRepository.cs
@@ -0,0 +1,26 @@
+using RegistrationOfPatients.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RegistrationOfPatients.Repositories.Implementations;
+
+public class PaymentRepository : IPaymentRepository
+{
+    public void CreateReception(Payment payment)
+    {
+        
+    }
+
+    public void DeletePayment(int id)
+    {
+        
+    }
+
+    public IEnumerable<Payment> ReadPayment(DateTime? dateForm = null, DateTime? dateTo = null, int? doctorId = null)
+    {
+        return Enumerable.Empty<Payment>();
+    }
+}
diff --git a/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/ReceptionRepository.cs b/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/ReceptionRepository.cs
new file mode 100644
index 0000000..ab777d6
--- /dev/null
+++ b/RegistrationOfPatients/RegistrationOfPatients/Repositories/Implementations/ReceptionRepository.cs
@@ -0,0 +1,21 @@
+using RegistrationOfPatients.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RegistrationOfPatients.Repositories.Implementations;
+
+public class ReceptionRepository : IReceptionRepository
+{
+    public void CreateReception(Reception reception)
+    {
+
+    }
+
+    public IEnumerable<Reception> ReadReception(DateTime? dateForm = null, DateTime? dateTo = null, int? doctorId = null, int? patientId = null)
+    {
+        return Enumerable.Empty<Reception>();
+    }
+}