class SumOfMultiples {
  int sum(List<int> numbers, int level) {
    Set<int> multiples = Set();
    numbers.forEach((n) {
      if (n != 0) {
        for (int i = n; i < level; i += n) {
          multiples.add(i);
        }
      }
    });
    return (multiples.length > 0) ? multiples.reduce((a, b) => a + b) : 0;
  }
}