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

int main(void)
{
	int a[3010];
	int n,first,second,i,val,flag;

	while(scanf("%d",&n) != EOF)
	{
		flag = 0;
		memset(a,0,sizeof(a));
		scanf("%d",&first);
		for (i = 1; i < n; i++)
		{
			scanf("%d",&second);
			val = abs(second-first);
			if ((val == 0 || val >= n) || (a[val] == 1))
			{
				printf("Not jolly\n");
				flag = 1;
				fflush(stdin);
				break;
			}
			a[val] = 1;
			first = second;
		}
		if (flag == 0)
		{
			printf("Jolly\n");
		}
	
		
	}
	return 0;
}