using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("---------------------------------------------------------\n");

        Console.WriteLine("\t \t \t \t \t MAIN MENU\n");

        Console.WriteLine("---------------------------------------------------------\n");

        Console.WriteLine(" 1. Addition\n 2. Subtraction\n 3.Multiplication\n 4.Division\n 5.Modulas\n");

        Console.WriteLine("Enter your choice : ");

        int ch = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Enter the value of a and b : ");

        int a = Convert.ToInt32(Console.ReadLine());

        int b = Convert.ToInt32(Console.ReadLine());

        switch(ch) {

            case 1: Console.WriteLine("Addition is {0} ",a+b);

                    break;

            case 2: Console.WriteLine("Subtraction is {0} ",a-b);

                    break;

            case 3: Console.WriteLine("Multiplication is {0} ",a*b);

                    break;

            case 4: Console.WriteLine("Division is {0} ",a/b);

                    break;

            case 5: Console.WriteLine("Modulas is {0} ",a%b);

                    break;

            default: Console.Write("Wrong Input");

                     break;

        }

    }

}