#include <stdio.h>
#include <stdlib.h>

int main(){
    int n = 0, z = 0, l =0, count[3000], temp[3000], lol = 0;

    while(scanf("%d", &n) != EOF){

    for(z = 0; z < n; z++)
        scanf("%d", &count[z]);

    for(z = 0; z < n - 1; z++)
         temp[z] = count[z] - count[z+1];

    for(z = 0; z < n - 1; z++){
        if(temp[z] < 0)
          temp[z] *= -1;
    }

    for(z = 0; z < n - 1; z++)
        for(l = 0; l < z; l++)
            if(temp[z] == temp[l] || temp[z] > n-1) lol++;

    if(lol == 0){
       printf("Jolly\n");
       lol = 0;
    }
    else{
       printf("Not jolly\n");
       lol = 0;
    }
    }

    return 0;
}