#include <bits/stdc++.h>
using namespace std;
string ch[2] = {"Vladik", "Valera"};
int num[2];
int main() {
  scanf("%d%d", &num[0], &num[1]);
  int t = 0, now = 1;
  while (1) {
    if (num[t] < now) {
      cout << ch[t] << endl;
      break;
    }
    num[t] -= now;
    t ^= 1;
    now++;
  }
}
