#include<stdio.h>
#include<math.h>
#include<string.h>

int a[1000] = {0};
int count[1000] = {0};
int main() {
	int n;
	scanf("%d%d", &n, &a[0]);
	int i, m;
	for(i = 1;i < n;i ++) {
		scanf("%d",&a[i]);
		m = abs(a[i] - a[i - 1]);
		count[m] ++;
	}
	for(i = 1;i < n;i ++) {
		if(count[i] == 0){
			printf("Not jolly");
			return 0;
		}
	}
	printf("Jolly");
	return 0;
}