#include <bits/stdc++.h>
using namespace std;
long long a, b;
int main() {
  cin >> a >> b;
  for (long long i = 1; i <= (long long)1e5; i++) {
    if (i % 2 == 0) {
      long long cur = i * (i + 1) / 2 - (1 + (i - 1)) / 2 * ((i - 2) / 2 + 1);
      if (cur > b) {
        cout << "Valera";
        return 0;
      }
    } else {
      long long cur = (i + 1) / 2 * ((i - 1) / 2 + 1);
      if (cur > a) {
        cout << "Vladik";
        return 0;
      }
    }
  }
  return 0;
}
