#include <bits/stdc+

#include <bits/stdc++.h>
using namespace std;

int main() {
int n;
cin >> n;
vector<int> a(n);
for (int i = 0; i < n; i++) cin >> a[i];

vector<bool> seen(n, false);   // 标记差值 d (1~n-1) 是否出现过
bool ok = true;
for (int i = 1; i < n; i++) {
    int d = abs(a[i] - a[i-1]);
    if (d < 1 || d > n-1) {     // 差值越界
        ok = false;
        break;
    }
    if (seen[d]) {              // 差值重复
        ok = false;
        break;
    }
    seen[d] = true;
}

cout << (ok ? "Jolly" : "Not jolly") << endl;
return 0;

}