#include <bits/stdc++.h>
using namespace std;
int main() {
  int vladik;
  int valera;
  int num = 1;
  bool flag = true;
  scanf("%d %d", &vladik, &valera);
  while (true) {
    if (flag) {
      vladik -= num;
      num++;
      flag = false;
      if (vladik < 0) {
        printf("Vladik\n");
        break;
      }
    } else {
      valera -= num;
      num++;
      flag = true;
      if (valera < 0) {
        printf("Valera\n");
        break;
      }
    }
  }
  return 0;
}
