Project Euler 6

Problem 6

using System;

namespace PE {
    public class PE006 {
        public static void Calc() {
            int sumsq = 0;
            for (int i = 1; i <= 100; i++) {
                sumsq += i * i;
            }
            int sqsum = (int)Math.Pow(100 * 101 / 2, 2);
            Console.WriteLine(sqsum - sumsq);
        }
    }
}