using System;

​

public class Program

{

    public static void Main()

    {

        int result = 0;

        Console.Write("Enter numbers: ");

        string inputNumbers = Console.ReadLine();

        string[] splitNumbers = inputNumbers.Split(' ');

        for (int i = 0; i < splitNumbers.Length; i++)

            result += Convert.ToInt32(splitNumbers[i]);

        Console.WriteLine("Result is: {0}", result);

    }

} 

​