#include<stdio.h>
int main(void)
{
	int n;
	int k = 0;
	int arr[1001];
	static int cnt;
	scanf("%d",&n);
	for (int i = 0;i < 1000;i++) 
	{
		scanf("%d", &arr[i]);
		k++;
		if (k == n)
			break;
	}
	for (int j = 1;j < n;j++) {
		for (int i = 0;i < n - 1;i++)
		{
			if (arr[i + 1] - arr[i] == j)
				cnt = 1;
		}
		if (cnt == 0)
		{
			printf("Not jolly");
			break;
		}
	}
	if (cnt == 1)
		printf("Jolly");
	return 0;
}