How to make simple mass calculator program in c#

How to make simple mass calculator program in c#

Object 

Write a program which takes a quantity mass as input and calculates Force applied on an object. (F=m*a)

Code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace simple

{

    class Program

    {

        static void Main(string[] args)

        {

      

            int m,f;

            int a=5;

            Console.Write("Please Insert a Mass: ");

            m = int.Parse(Console.ReadLine());

            f = m * a;

            Console.WriteLine("Force is:  " + f);

        }