#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    int n;
    int a[n];
    cin>>n;
    for(long int i=0;i<n;i++) cin>>a[i];

    int m;
    m=n-1;
    int b[m]={0};
    for(int j=0;j<n-1;j++)
    {
        int x;
        x=abs(a[j+1]-a[j])-1;
        if(x<n-1)
        b[x]=1;
    }
    //for(int i=0;i<n-1;i++) cout<<b[i]<<" ";

    int flag=0;
    for(long int k=0;k<n-1;k++)
    {
        if(b[k]==0) {cout<<"Not jolly";flag=1;break;}
    }
    if(flag==0) cout<<"Jolly";
}