public int solution(int left, int right) {

int answer = 0;

int pos = IntStream.rangeClosed(left, right)

.filter(a ->

IntStream.rangeClosed(1, a)

.filter(b -> a % b == 0)

.count() % 2 == 0

)

.sum();

int neg = IntStream.rangeClosed(left, right)

.filter(a ->

IntStream.rangeClosed(1, a)

.filter(b -> a % b == 0)

.count() % 2 == 1

)

.sum();

answer = pos - neg;

return answer;

}

}