using System;

public class Program

{

    public static void Main()

    {

        int a=10;

        int b=5;

        int c=2;

        int d=20;

        Console.WriteLine(a+b);

        Console.WriteLine(d-c);

        Console.WriteLine(a+b);

        Console.WriteLine(a/b);

        Console.WriteLine(b%c);

        Console.WriteLine(d%c);

        Console.WriteLine(d);

        d++;

        Console.WriteLine(d);

        b--;

        Console.WriteLine(b);

        a+=5;

        Console.WriteLine(a);

        c-=3;

        Console.WriteLine(c);

    }

}