#include<iostream>
using namespace std;
int main(){
	int n;
	int b[2000];
	int flag=0;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>b[i];} 
	for(int m=1;m<=n;m++){
		if(((b[m]-b[m+1] )*(b[m]-b[m+1] ))<1||((b[m]-b[m+1] )*(b[m]-b[m+1] ))>(n-1)*(n-1))
			flag=1;
		}
	if(flag==0)
		cout<<"Jolly";
	if(flag==1)
		cout<<"Not jolly";
	flag=0;
	return 0;}