C++简洁代码：

#include<bits/stdc++.h>
using namespace std;
int main () {
    int core;
    string res;
    cin >> core;
    if (core >= 10) res = "Danger++";
    else if (core >= 4 && core <= 9) res = "Danger";
    else res = "Good";
    cout << res << endl;
    return 0;
}