Competitive Programming

#include<stdio.h>
#include<stdlib.h>
int main() {
    int n, A[3001], i;
    while(scanf("%d", &n) == 1) {
        for(i = 0; i < n; i++)
            scanf("%d", &A[i]);
        int mark[3001] = {0}, flag = 0;
        for(i = 1; i < n; i++) {
            if(abs(A[i] - A[i-1]) < n)
                mark[abs(A[i] - A[i-1])]++;
        }
        for(i = 1; i < n; i++)
            if(mark[i] == 0)
                flag = 1;
        if(flag)
            puts("Not jolly");
        else
            puts("Jolly");
    }
    return 0;
}