#include<bits/stdc++.h>
#define LL long long
#define F(x,y,z,o) for(int o=x;o<=y;o+=z)
using namespace std;
LL a[1005],ab[1005]; 
int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	int n;
	cin>>n;
	F(1,n,1,i)
	{
		cin>>a[i];
	}
	F(1,n-1,1,i)
	{
		ab[abs(a[i]-a[i+1])]++;
	}
	int f=0;
	F(1,n-1,1,i)
	{
		if(ab[i]==0)
		{
			cout<<"Not jolly";
			f=1;
			return 0;
		}
	}
	if(f==0) cout<<"Jolly";
	return 0;
}