using System;

public class Program

{

    static int GetSum(int a, int b, int c)

    {

        return a + b +c;

    }

    static int GetMiNus(int a, int b, int c)

    {

        return a - b - c;

    }

    static int GetMultiPly(int a, int b, int c) 

    {

        return a * b * c;

    }

    static double GetDivide(double a, double b, double c)

    {

        return a / b / c;

    }

    public static void Main()

    {

        int a,b,c;

        Console.Write("1r too:"); a = Convert.ToInt32(Console.ReadLine());

        Console.Write("2r too:"); b = Convert.ToInt32(Console.ReadLine());

        Console.Write("3r too:"); c = Convert.ToInt32(Console.ReadLine());

        double urdun=GetDivide(a,b,c);

        Console.WriteLine("a + b + c =" + GetSum(a,b,c));

        Console.WriteLine("a - b - c =" + GetMiNus(a,b,c));

        Console.WriteLine("a * b * c =" + GetMultiPly(a,b,c));

        Console.WriteLine("a / b / c =" + urdun);

    }

}