P1152 欢乐的跳

// Problem: P1152 欢乐的跳
// Contest: Luogu
// URL: https://www.luogu.com.cn/problem/P1152
// Memory Limit: 125 MB
// Time Limit: 1000 ms
// User: Pannnn

#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    
    int n;
    cin >> n;
    
    vector<int> info(n);
    vector<int> t(n);
    for (int i = 0; i < n; ++i) {
        cin >> t[i];
    }
    
    for (int i = 1; i < n; ++i) {
        int tmp = abs(t[i] - t[i - 1]);
        if (tmp >= 1 && tmp <= n - 1) {
            ++info[tmp];
        }
    }
    
    for (int i = 1; i < n; ++i) {
        if (info[i] == 0) {
            cout << "Not jolly" << endl;
            return 0;
        }
    }
    cout << "Jolly" << endl;
    return 0;
}