#include <bits/stdc++.h>
using namespace std;
int main() {
  int vladikCandies, valeraCandies;
  cin >> vladikCandies >> valeraCandies;
  int nextRound = 1;
  while (1) {
    if (vladikCandies < nextRound) {
      cout << "Vladik" << endl;
      break;
    }
    vladikCandies -= nextRound;
    nextRound++;
    if (valeraCandies < nextRound) {
      cout << "Valera" << endl;
      break;
    }
    valeraCandies -= nextRound;
    nextRound++;
  }
  return 0;
}
