#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  long long int a, b;
  cin >> a >> b;
  long long int sumo = 0, sume = 0;
  for (int i = 1;; i++) {
    sumo = i * i;
    if (sumo > a) {
      cout << "Vladik" << endl;
      break;
    }
    sume = i * (i + 1);
    if (sume > b) {
      cout << "Valera" << endl;
      break;
    }
  }
}
