#include <bits/stdc++.h>

using namespace std;

int n, f;
int a[1005];

int main() {
	const string mut = "olly";
	string wil[2] = {"Not j", "J"};
	cin >> n;
	for (int i = 1; i <= n; i++)
		cin >> a[i];
	for (int i = 0; i < n; i++)
		a[i] = abs(a[i + 1] - a[i]);
	sort(a, a + n);
	if (a[n - 1] == n - 1) f = 1;
	else f = 0;
	cout << wil[f] << mut;
	system("pause");
	return 0;
}