#include <bits/stdc++.h>
using namespace std;
int main() {
  long long t = 1;
  while (t--) {
    long long vladik, valera;
    cin >> vladik >> valera;
    long long v = 1;
    for (long long i = 0;; i++) {
      if (i % 2 == 0) {
        vladik -= v;
        v++;
      } else {
        valera -= v;
        v++;
      }
      if (vladik < 0 || valera < 0) break;
    }
    if (vladik < 0)
      cout << "Vladik" << endl;
    else
      cout << "Valera" << endl;
  }
}
