Problem 6. Sum square difference

import java.lang.Math;

public class euler6 {
    public static void main(String[]args) {
	int N = 100;
	int sum = 0;
	int sum1 = 0;
	int sum2 = 0;
	for (int i = 1; i <= N; i++) {
	    sum1 += Math.pow(i,2);
	}
	for (int i = 1; i <= N; i++)
	    sum += i;
	sum2 = (int)Math.pow(sum, 2);
	System.out.println(sum2 - sum1);
    }
}