#include <bits/stdc++.h>
using namespace std;
long long a[1005];
int main() {
	long long n,s;
	cin >> n;
	s=n-1;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	for (int i = 1; i <= n; i++) {
		if(a[i]>a[i+1]){
			if((a[i]-a[i+1])>s){
				cout << "Not jolly";
				return 0;
			}else{
				continue;
			}
		}else{
			if(a[i]==a[i+1]){
				cout << "Not jolly";
				return 0;				
			}else{
				if((a[i+1]-a[i])>s){
					cout << "Not jolly";
					return 0;					
				}else{
					continue;
				}
			}
		}
	}
	cout << "Jolly";
	return 0;
}