#include<stdio.h>
#include <algorithm>
using namespace std;
int main()
{
long int a[9999],n,i,b[9999],c,k;
while(scanf("%ld",&n)==1&&n>0)
{
c=0;
for(i=0; i<n; i++)
scanf("%ld",&a[i]);
for(i=1; i<n; i++)
{
b[c]=a[i]-a[i-1];
(b[c]<0)?b[c]*=(-1):b[c]*=1;
c++;
}
sort(b,b+c);
for(i=0; i<c-1; i++)
{
if(b[i]==b[i+1]||b[i]>n-1||b[i+1]>n-1)
{
k=0;
break;
}
else
k=1;
}
(k==0)?printf("Not jolly\n"):printf("Jolly\n");
}
return 0;
}
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