#include<iostream>
#include<set>
#include<stdio.h>
using namespace std; int my_abs(int);
int main()
{
//freopen("acm.acm","r",stdin);
int num;
int i;
int * a;
set<int> coll;
while(cin>>num)
{
a = new int[num];
for(i = ; i < num; ++ i)
{
cin>>a[i];
}
for(i = ; i < num - ; ++ i)
{
coll.insert(my_abs(a[i] - a[i+]));
}
if((coll.size() == num - &&*coll.begin() == && *coll.rbegin() == num - ||num == ))
cout<<"Jolly"<<endl;
else
cout<<"Not jolly"<<endl;
coll.clear();
delete[] a;
}
}
int my_abs(int num)
{
if(num >= )
return num;
else
return num * (-); }