这题在洛谷上是红题。

真的有亿点难……

# include <iostream>
using namespace std;
int main (){
    int m = 0, q = 0, r, t = 1;
    for (int i = 1; i <= 12; i++){
        int x;
        cin >> x;
        m += 300;
        m -= x;
        if (m < 0){
            t = 0;
            r = 0 - i;
            break;
        }else{
            q += m / 100;
            m %= 100;
        }
    }
    if (t == 0){
        cout << r;
        return 0;
    }
    cout << m + q * 120;
    return 0;
}