#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
while(cin>>n)
{
int c=0,d=1;
int a[n],b[n];
for(int i=0;i<n;i++)
{
cin>>a[i];
}
for(int i=1;i<n;i++)
{
b[i]=abs(a[i]-a[i-1]);
}
sort(b+1,b+n);
for(int i=1;i<n;i++)
{
if(b[i]!=i)
{
c++;
break;
}
}
if(c==0)
{
cout<<"Jolly"<<"\n";
}else
{
cout<<"Not jolly"<<"\n";
}
}
return 0;
}
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