text: #include <string>
  
  #include "libop/op.h"
  
  
  int main(int argc, char** argv) {
      uint64_t solution = 1;
      for (int i : op::range(1, 21)) {
          solution = op::lcm(solution, i);
      }
  
      op::print(solution);
  
      return 0;
  }
  