using System;

public class Program

{

    public static void Main()

    {

        add(3,78);

        sub(78,2);

        times(45,3);

        div(15,3);

    }

    public static void add(int x, int y)

    {

    Console.WriteLine(x + y);

    }

    public static void sub(int x, int y)

    {

    Console.WriteLine(x - y);

    }

    public static void times(int x, int y)

    {

    Console.WriteLine(x * y);

    }

    public static void div(int x, int y)

    {

    Console.WriteLine(x/y);

    }

}