using System;

​

int num1;

int num2;

int num3;

int result;

​

Console.WriteLine("Type in the 1st number");

int.Parse("num1");

Console.WriteLine("Type in the 2nd number");

int.Parse("num2");

Console.WriteLine("Type in the 3rd number");

int.Parse("num3");

​

result = num1 + num2;

int.Parse("result");

result = num1 + num3;

int.Parse("result");

result = num2 + num3;

int.Parse("result");

result = num1 + num2+ num3;

int.Parse("result");