#include <bits/stdc++.h>
using namespace std;
int a[1000],b[1000];
int main()
{
	int n;
	bool t=true;
	cin >> n;
	for (int i=1;i<=n;i++)
	{
		cin >> a[i];
	}
	for (int j=1;j<=n-1;j++)
	{
		int c=abs(a[j]-a[j+1]);
		b[c]=c;
	}
	for (int k=1;k<=n-1;k++)
	{
		if (b[k]!=k)
		{
			t=false;
			break;
		}
	}
	if (t==true)
		cout << "Jolly" << endl;
	else
		cout << "Not jolly" << endl;
	return 0;
}