#include<stdio.h>
#include<stdlib.h>

int main(){
	int i,k,m = 0,n,a,max1 = 0,max2 = 0,sum = 0,temp,temp1=0;
	while(scanf("%d",&a)!=EOF){
		if(a<3000){
		scanf("%d",&n);
		m=n;
		temp = n;
		for(i=1;i<a;i++){
			scanf("%d",&n);
			if(max1<n)
				max1 = n;
			m = abs(m-n);
			sum+=m;
			if(max2<m)
				max2 =m;
			m = n;
		}
		if(temp>max1)
			max1=temp;
		for(k=1;k<=max2;k++){
			temp1=temp1+k;
		}
		if((max1-1)==max2&&sum==temp1)
			printf("Jolly\n");
		else
			printf("Not jolly\n");
		}
		else
			break;
		max1 = 0,max2 = 0,sum = 0,temp1=0,i=0,k=0;
	}
	return 0;
}