#include <iostream>
#include <cstdlib>
using namespace std;
int main() {
	int a[1005];
	int n, ans, flag = 1;
	cin >> n;
	for (int i = 1; i <= n; i++) cin >> a[i];
	int b[1005];
	for (int i = 2; i <= n; i++) {
		int c = abs(a[i] - a[i - 1]);
		b[c]++;
	}
	for (int i = 1; i <= n - 1; i++) {
		if (b[i] == 0) {
			flag = 0;
		}
	}
	if (flag == 0) cout << "Not jolly";
	else cout << "Jolly";
	return 0;
}