#include <stdio.h>
int main (void)
{
    int n;
    scanf("%d",&n);
    int s[n],i=0,a[n];
    scanf("%d",&s[i]);
    i=1;
    while(scanf("%d",&s[i])==1)
    {
        a[i]=0;
        int b=(s[i]-s[i+1])>=0?(s[i]-s[i+1]):-(s[i]-s[i+1]);
        a[b]=b;
        i++;
    }
    for(i=1;i<=n-1&&a[i]==i;i++)
    ;
    if(i>n-1)
    printf("Jolly");
    else
    printf("Not jolly");
    return 0;
}