#include <bits/stdc++.h>
using namespace std;
int n, m, cnt;
int main() {
  cin >> n >> m;
  for (int i = 0; i < 1e9; i++) {
    cnt++;
    if (i % 2 == 0) {
      if (n >= cnt)
        n -= cnt;
      else {
        cout << "Vladik";
        exit(0);
      }
    } else {
      if (m >= cnt)
        m -= cnt;
      else {
        cout << "Valera";
        exit(0);
      }
    }
  }
}
