import java.io.*;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new FileReader("jolly.in"));
		String[] tmp =  br.readLine().split(" ");
		br.close();

		int n = Integer.parseInt(tmp[0]);

		if (n == 0) {
			BufferedWriter bw = new BufferedWriter(new FileWriter("jolly.out"));
			bw.write("Not jolly");
			bw.close();
			return;
		}
		if (n == 1) {
			BufferedWriter bw = new BufferedWriter(new FileWriter("jolly.out"));
			bw.write("Jolly");
			bw.close();
			return;
		}

		int[] arr, arr2, arr3;
		arr = new int[n]; // числа
		for (int i = 1; i <= n; ++i)
			arr[i - 1] = Integer.parseInt(tmp[i]);
		arr2 = new int[n - 1]; // разности
		for (int i = 0; i < n - 1; ++i)
			arr2[i] = Math.abs(arr[i] - arr[i + 1]);

		boolean res = true;
		for (int i = 1; i < n; ++i) {
			boolean chg = false;
			for (int j = 0; j < n - 1; ++j)
				if (arr2[j] == i) {
					arr2[j] = -1;
					chg = true;
				}

			if (chg == false) res = false;
		}

		BufferedWriter bw = new BufferedWriter(new FileWriter("jolly.out"));
		if (res)
			bw.write("Jolly");
		else
			bw.write("Not jolly");
		bw.close();
	}
}