#include <bits/stdc++.h>
using namespace std;
int a[2];
string ans[2] = {"Vladik", "Valera"};
int main() {
  cin >> a[0] >> a[1];
  int turn = 0;
  int sub = 1;
  while (true) {
    if (a[turn] - sub >= 0) {
      a[turn] -= sub;
    } else {
      break;
    }
    sub++;
    turn = 1 - turn;
  }
  cout << ans[turn] << endl;
  return 0;
}
