#include <bits/stdc++.h>
using namespace std;
long long read() {
  long long rtn = 0;
  char ch = getchar();
  while (ch > '9' || ch < '0') ch = getchar();
  while (ch <= '9' && ch >= '0')
    rtn = (rtn << 3) + (rtn << 1) + ch - '0', ch = getchar();
  return rtn;
}
const int N = 1000010;
int n;
int a[3];
int main() {
  a[0] = read();
  a[1] = read();
  for (int i = 1, now = 0;; now ^= 1, i++) {
    if (a[now] < i) {
      printf("%s\n", now ? "Valera" : "Vladik");
      return 0;
    }
    a[now] -= i;
  }
  return 0;
}
