class DifferenceOfSquaresCalculator {

    int computeSquareOfSumTo(int input) {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }

    int computeSumOfSquaresTo(int input) {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }

    int computeDifferenceOfSquares(int input) {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }

}