using System;
namespace P3-6
{
    class Program
    {
      static void Main(string[] args)
        {
           int count,sum;
            count = 1;
            sum = 0;
            do
            {
                sum += count;
                count++;
            } while (count <= 100);
            Console.WriteLine("1100ۼӺǣ{0}",sum);
            Console.ReadLine();
     }
    }
}
