#include<iostream>
using namespace std;
long long a[2000];
long long b[2000];
int main()
{
	int t = 0;
	int n;
	cin >> n;
	cin >> a[1];
	for (int i = 2; i <= n; i++)
	{
		cin >> a[i];
		b[abs(a[i] -a[i  - 1])] = 1;
	}
	for (int i = 1; i <= n - 1; i++)
	{
	
		if (b[i] == 1)
			t++;
	}
	if (t == n - 1)
		cout << "Jolly";
	else
		cout << "Not jolly";
	return 0;
}