#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b;
  cin >> a >> b;
  int x1 = sqrt(a);
  int x2 = 1;
  for (; x2 * x2 + x2 <= b; x2++) {
  }
  x2--;
  if (x1 == x2) {
    cout << "Vladik" << endl;
    return 0;
  }
  if (x1 < x2) {
    cout << "Vladik" << endl;
    return 0;
  }
  cout << "Valera" << endl;
  return 0;
}
