文件目录

#include <iostream>
using namespace std;
int main()
{
    int ys = 0; // 预算
    int a = 0;  // 手里的钱
    int mm = 0;
    for (int i = 1; i <= 12; i++)
    {
        cin >> ys;
        a += 300;
        if (ys > a)
        {
            cout << -i;
            return 0;
        }
        a -= ys;
        mm += a / 100 * 100;
        a %= 100;
    }
    cout << mm * 1.2 + a;
    return 0;
}