Merge pull request 'ветка-1' (#1) from B-1 into main

Reviewed-on: #1

main.cpp

@@ -1,5 +1,11 @@
 #include <iostream>
+int factorial(int n) {
+    return (n == 1 || n == 0) ? 1 : n * factorial(n - 1);
+}
 int main() {
-    std::cout << "Hello, World!" << std::endl;
+    int num;
+    std::cout << "Enter a number: ";
+    std::cin >> num;
+    std::cout << "Factorial: " << factorial(num) << std::endl;
     return 0;
 }