public class TestWork {
	public static void main(String[] args) {
		int sum = 0;
		for (int i = 1; i <= 100; i++) {
			for (int j = 1; j <= i; j++) {
				sum += j;
			}
		}
		System.out.println("∑1+∑2+...+∑100=" + sum);
	}
}

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