diff --git a/project.cpp b/project.cpp
index 78e3b4b..2566585 100644
--- a/project.cpp
+++ b/project.cpp
@@ -12,6 +12,10 @@ int main()
     std::cout << "a + b = " << a + b << "\n";
     std::cout << "a*b = " << a * b << "\n";
     std::cout << "a /b = " << a / b << "\n";
+    size_t sum = 0;
+    for (size_t i = 0; i < 10; i++)
+        sum += i * 3 - 5;
+    std::cout << "sum = " << sum << "\n";
 }
 
 // Запуск программы: CTRL+F5 или меню "Отладка" > "Запуск без отладки"