using System;

public class Program

{

    public static void Main()

    {

        int fn,sn,op,res;

        Console.WriteLine("Select Any operation you want to perform:");

        Console.WriteLine("Select 1 for Addition:");

        Console.WriteLine("Select 2 for Subtration:");

        Console.WriteLine("Select 3 for Multiplition:");

        Console.WriteLine("Select 4 for Divition:");

        Console.WriteLine("Select 5 for Percentage:");

        op = Convert.ToInt32(Console.ReadLine());

        switch (op)

        {

            case 1:

                Console.WriteLine("Enter First number:");

                fn = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine("Enter Second number:");

                sn = Convert.ToInt32(Console.ReadLine());

                res = fn + sn;

                Console.WriteLine("Sum of {0} and {1} is {2}", fn, sn, res);

                break;

            case 2: 

                Console.WriteLine("Enter First number:");

                fn = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine("Enter Second number:");

                sn = Convert.ToInt32(Console.ReadLine());

                res = fn - sn;

                Console.WriteLine("Sub of {0} and {1} is {2}", fn, sn, res);

                break;

            case 3: 

                Console.WriteLine("Enter First number:");

                fn = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine("Enter Second number:");

                sn = Convert.ToInt32(Console.ReadLine());

                res = fn * sn;

                Console.WriteLine("Product of {0} and {1} is {2}", fn, sn, res);

                break;

            case 4: 

                Console.WriteLine("Enter First number:");

                fn = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine("Enter Second number:");

                sn = Convert.ToInt32(Console.ReadLine());

                res = fn / sn;

                Console.WriteLine("Div of {0} and {1} is {2}", fn, sn, res);

                break;

            case 5: 

                Console.WriteLine("Enter total number:");

                fn = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine("Enter how many percent you want:");

                sn = Convert.ToInt32(Console.ReadLine());

                res = (fn/100) * sn;

                Console.WriteLine("Div of {0} and {1} is {2}", fn, sn, res);

                break;

        }

    }

}