#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int a, b;
  scanf("%lld%lld", &a, &b);
  long long int n1, n2;
  n1 = sqrt(a);
  n2 = (sqrt(4 * b + 1) - 1) / 2;
  if (n1 <= n2)
    printf("Vladik\n");
  else
    printf("Valera\n");
  return 0;
}
