using System;

public class Program

{

    public static void Main()

    {

        int a = 7;

        int b = 3;

        char operation ='*';

        if (operation =='+')

            Console.WriteLine(a + b);

        else if (operation =='-')

            Console.WriteLine(a - b);

        else if (operation =='*')

            Console.WriteLine(a * b);

        else if (operation =='/')

            Console.WriteLine(a / b);

    }

}