#include<iostream>
#include<algorithm> 
#include<cmath>

using namespace std;

int n,a[1005],b[1005];
int main(){
	cin >> n;
	for(int i = 1; i <= n; i++){
		cin >> a[i];
	}
	for(int i = 1; i <= n; i++){
		b[i] = abs(a[i - 1] - a[i]);
	}
	sort(b + 1, b + n + 1);
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= n - 1; j++){
			if(b[i] != a[j]){
				cout << "Not jolly" << endl;
				return 0;
			}
		}
	}
	cout << "Jolly" << endl;
	return 0;
}