jls10_2.java

class Gauss {
	public static void main(String[] args) {
		int[] ia = new int[101];
		for (int i = 0; i < ia.length; i++)
			ia[i] = i;
		int sum = 0;
		for (int i = 0; i < ia.length; i++)
			sum += ia[i];
		System.out.println(sum);
	}
}