#include <bits/stdc++.h>//下面两个头文件是IDE自己加上去的，可忽略
#include <algorithm>
#include <functional>

#define int long long //不开long long见祖宗

#pragma Mingw - GCC optimize(3)

using namespace std;

vector<int> vec, vec0;

signed main() {
  int n;
  scanf("%lld", &n);
  for (int i = 1; i <= n; ++i) {
    int t;
    scanf("%lld", &t);
    vec.push_back(t);
  }
  int before;
  bool flag = false;
  for (auto i : vec) {
    if (flag == 0) {
      before = i;
      flag = 1;
      continue;
    }
    int t = abs(i - before);
    before = i;
    vec0.push_back(t);
  }
  sort(vec0.begin(), vec0.end());
  if (vec0.size() != vec0.back()) {
    printf("Not jolly\n");
    return 0;
  }
  printf("Jolly");
  return 0;
}