#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
bool f = 0;
int main()
{
	int n; 
	cin >> n;
	vector<int> arr(n);
    vector<int> arr1(n - 1);
	for(int i = 0; i < n; i++)
	{
		cin >> arr[i];
	}
	for(int i = 0; i < n - 1; i++)
	{
		arr1[i] = abs(arr[i] - arr[i + 1]);
	}
	sort(arr1. begin(), arr1.end());
	for(int i = 0; i < n - 1; i++)
	{
		if(arr1[i] != i + 1)
		{
			f = 1;
             break;
		}

	}
	if(f)
	{
		cout << "Not jolly\n";
	}
	else cout << " Jolly\n";
	return 0;
}