# include <iostream>
using namespace std;
int main()
{
    int n,num=0;
    cin>>n;
    int a[n];
    for(int i=0;i<n;i++)
    {
        cin>>a[i];
    }
    for(int i=0;i<n-1;i++)
    {
        if(a[i]<a[i+1])
        {
            if((a[i]-a[i+1])==(a[i+1]-a[i])-(a[i+1]-a[i])*2)
            {
                num++;
            }
            else
            {
                cout<<"Not jolly";
                return 0;
            }
        }
        if(a[i+1]<a[i])
        {
            if((a[i+1]-a[i])==(a[i]-a[i+1])-(a[i]-a[i+1])*2)
            {
                num++;
            }
            else
            {
                cout<<"Not jolly";
                return 0;
            }
        }
    }
    if(num==n-1)
    {
        cout<<"Jolly";
    }
    return 0;
}