#include<iostream>
using namespace std;
int p[10001];
int p1[10001];
int main()
{
	int n, sum = 0;
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		cin >> p[i];
		if (i < n - 1)
		{
			p1[i] = i+1;
		}
		int a = p[i] - p[i + 1];
		for (int j = 0; j < n - 1; j++)
		{
			if (abs(a) == p1[j])
			{
				p1[j] = n;//将已经验证存在的差值排除
				sum++;
			}
		}
	}
	if (sum == n - 1)
	{
		cout << "Jolly" << endl;
	}
	else
	{
		cout << "Not jolly" << endl;
	}
	system("pause");
	return 0;