Jolly Jumpers

#include <bits/stdc++.h>
using namespace std;
#define PB push_back
#define ZERO (1e-10)
#define INF (1<<29)
#define CL(A,I) (memset(A,I,sizeof(A)))
#define DEB printf("DEB!\n");
#define D(X) cout<<"  "<<#X": "<<X<<endl;
#define EQ(A,B) (A+ZERO>B&&A-ZERO<B)
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef pair<int,int> ii;
typedef vector<ii> vii;
#define IN(n) int n;scanf("%d",&n);
#define FOR(i, m, n) for (int i(m); i < n; i++)
#define REP(i, n) FOR(i, 0, n)
#define F(n) REP(i, n)
#define FF(n) REP(j, n)
#define FT(m, n) FOR(k, m, n)
#define aa first
#define bb second
void ga(int N,int *A){F(N)scanf("%d",A+i);}
bool cn[3001];
int N,S,A[3001],a;
bool jl(){
    F(N-1){
        a=abs(A[i]-A[i+1]);
        if(!a||a>=N||cn[a]++)return 0;
    }
    return 1;
}
int main(void){
    while(~scanf("%d",&N))
        CL(cn,0),ga(N,A),S=0,printf("%solly\n",jl()?"J":"Not j");
    return 0;
}