#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,a[110],i;
    cin>>n;
    for(i = 1;i <= n;i++){
    	cin>>a[i];
	}
	
	int f1 = 1;//假设递增
	int f2 = 1;//假设递减 
	
	for(i = 1;i < n;i++){
		if(a[i] > a[i+1]){
			f1 = 0;
		}
		
		if(a[i] < a[i+1]){
			f2 = 0;
		}
	}
	
	if(f1 == 0 && f2 == 0){
		cout<<"No";
	}else{
		cout<<"Good";
	}
    return 0;
}
/**************************************************************
	Problem: 1807
	User: admin
	Language: C++
	Result: Accepted
	Time:31 ms
	Memory:2072 kb
****************************************************************/