#include<bits/stdc++.h>
using namespace std;

int main()
{
	int n,a,b,abc[3005] = {0};
	scanf("%d",&n);
	scanf("%d",&a);
	for (int i = 1; i < n; i++)
	{
		scanf("%d",&b);
		abc[abs(a - b)]++;
		a = b; 
	}
	for (int i = 1; i < n; i++)
	{
		if (abc[i] != 1)
		{
			printf("Not jolly");
			return 0;
		}
	}
	printf("Jolly");
	
	return 0;
}