#include <string>
#include <cmath>
using namespace std;
int se[3001] ;
int num[3001] ;
void MakeSe( int n )
{    int i ;
     memset(se , 0 , sizeof(se)) ;
     for ( i = 0 ; i < n - 1 ; i++ )
        {   se[(int)fabs(double(num[i] - num[i+1]))] = 1 ;
        }
}
bool Judge(int  n)
{    int i ;
     for ( i = 1 ; i < n && se[i] == 1 ; i++ ) ;
     if ( i == n )
       return true ;
     else
       return false ;
        
     
     
}
int main()
{   int n;
    while ( scanf("%d" , &n) != EOF )
         {   int i ;
             for ( i = 0 ; i < n ; i++ )
                scanf("%d" , &num[i]) ;
             MakeSe(n) ;
             if (Judge(n))
               printf("Jolly\n") ;
             else
               printf("Not jolly\n") ;          
         }
    
}