#include <bits/stdc++.h>
const long long INFLL = 2 * 1e18 + 100;
const int INFINT = 2 * 1e9 + 100;
using namespace std;
void die() {
  cout << "NO";
  exit(0);
}
const int NMAX = 1e5 + 5;
const int MOD = 1e8;
const double PI = atan(1) * 4;
const double EPS = 1e-12;
int main() {
  ios_base::sync_with_stdio(0);
  long long a, b;
  cin >> a >> b;
  long long ra = sqrt(a);
  long long rb = ((-1 + sqrt(1 + 4 * b)) / 2);
  if (rb < ra)
    cout << "Valera";
  else
    cout << "Vladik";
  return 0;
}
