import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num1 = scanner.nextInt();
        int[] count = new int[80];
        int[] a = new int[num1];
        int[] b = new int[num1];
        int[] c = new int[num1];
        for (int i = 0; i < num1; i++) {
            c[i] = b[i] = a[i] = scanner.nextInt();
        }
        int flag1 = 0,flag2 = 2;
        paiXux(a);
        paiXud(b);
        for (int i = 0; i < num1; i++) {
            if(c[i] != a[i]){
                flag1 = 1;
                break;
            }
        }
        for (int i = 0; i < num1; i++) {
            if(c[i] != b[i]){
                flag2 = 1;
                break;
            }
        }
        if(flag1 == 0 || flag2 == 2) System.out.println("Good");
        else System.out.println("No");



    }public static void paiXu(int[] a,int length){
        int temp;
        for(int i = 0;i < length - 1;i++){
            for(int k = 0;k < length - i - 1;k++){
                if(a[k] > a[k + 1]){
                    temp = a[k];
                    a[k] = a[k + 1];
                    a[k + 1] = temp;
                }
            }
        }
    } public static void paiXud(int[] a){
        int temp;
        for(int i = 0;i < a.length - 1;i++){
            for(int k = 0;k < a.length - i - 1;k++){
                if(a[k] < a[k + 1]){
                    temp = a[k];
                    a[k] = a[k + 1];
                    a[k + 1] = temp;
                }
            }
        }
    } public static void paiXux(int[] a){
        int temp;
        for(int i = 0;i < a.length - 1;i++){
            for(int k = 0;k < a.length - i - 1;k++){
                if(a[k] > a[k + 1]){
                    temp = a[k];
                    a[k] = a[k + 1];
                    a[k + 1] = temp;
                }
            }
        }
    }

    public static int MAX(int[] a){
        int max = a[0];
        for (int i = 0; i < a.length; i++) {
            if(max < a[i]){
                max = a[i];
            }
        }
        return max;
    }

    public static int MIN(int[] a){
        int min = a[0];
        for (int i = 0; i < a.length; i++) {
            if(min > a[i]){
               min = a[i];
            }
        }
        return min;
    }
    public static int sum(int a){
        int x,s = 0;
        while(a != 0){
            x = a % 10;
            s = s + x;
            a /= 10;
        }
        return s;
    }
    public static boolean isPrime(int a){
        if(a <= 1)return false;
        else
        for(int i = 2;i <= Math.sqrt(a);i++){
            if(a % i == 0)return false;
        }return true;
    }

    public static long qiuYu(long i){
        long a;
        a = i % 10;
        return a;
    }
}

/**************************************************************
	Problem: 1807
	User: admin
	Language: Java
	Result: Accepted
	Time:1469 ms
	Memory:40304 kb
****************************************************************/