#include <bits/stdc++.h>
int main() {
  int a, b;
  std::cin >> a >> b;
  unsigned long sqrta = sqrt(a);
  unsigned long form_add = (-1 + sqrt(1 + (unsigned long)4 * b)) / 2;
  if (sqrta <= form_add)
    std::cout << "Vladik";
  else
    std::cout << "Valera";
}
