#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    int num,a[3000];
    while(1)
	{
		cin>>num;
		if(num<=0&&num>=3000)
			break;
		for(int i=0;i<num;i++)
		{
			cin>>a[i];
		}
		int b=0;
		for(i=0;i<(num-1);i++)
		{
			if(abs(a[i+1]-a[i])!=(num-i-1))
			{
				b=1;
			    break;
			}
		}
        if(b==0) 
			cout<<"Jolly"<<endl;
        else 
			cout<<"Not jolly"<<endl;
	}
	return 0;
}