diff --git a/main.cpp b/main.cpp
index 04b6ac8..74f86a0 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,8 +1,15 @@
 #include <iostream>
+int factorial(int n) {
+    return (n == 1 || n == 0) ? 1 : n * factorial(n - 1);
+}
 int sum(int a, int b) {
     return a + b;
 }
 int main() {
+    int num;
+    std::cout << "Enter a number: ";
+    std::cin >> num;
+    std::cout << "Factorial: " << factorial(num) << std::endl;
     int x, y;
     std::cout << "Enter two numbers: ";
     std::cin >> x >> y;