#include <iostream>

#include <cmath>

using namespace std;

​

int main() {

  cout << cbrt(0) << "\n";

  cout << cbrt(1) << "\n";

  cout << cbrt(27) << "\n";

  cout << cbrt(0.64) << "\n";

  cout << cbrt(-27) << "\n";

  return 0;

}

​