using System;

public class Program

{

    public static void Main()

    {

          Console.WriteLine("Enter the integer n number:");

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

        Console.WriteLine("Enter the integer m number");

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

        int sum = 0;

        while(first <= second) { 

        sum += first;

        first++; }

        Console.WriteLine("Sum from n to me is " + sum);

​

    }

}