#include <bits/stdc++.h>
using namespace std;
const int N = 1e6;
int x, y;
long long sm;
int main() {
  cin >> x >> y;
  for (int i = 1; i < N; ++i) {
    if (y < 0 || x < 0) break;
    if (i & 1)
      x -= i;
    else
      y -= i;
  }
  if (y < 0)
    cout << "Valera";
  else
    cout << "Vladik";
}
