// Комната
package Bronze_IV_4;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Ex27245 {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int w = Integer.parseInt(br.readLine());
int l = Integer.parseInt(br.readLine());
int h = Integer.parseInt(br.readLine());
if (Math.min(w, l) / h >= 2 && Math.max(w, l) / Math.min(w, l) <= 2) {
System.out.println("good");
}else {
System.out.println("bad");
}
}
}