```cpp
#include <bits/stdc++.h>
using namespace std;
int main(){
long long int money=0,in,cj=0;//cj，储蓄进的钱数;
int bg=0;//不够嘛？
for(int i=1;i<=12;i++){
cin >> in;
money += 300;
money -= in;
if (money < 0) {
bg = i;
break;
}
else if (money >= 100){
cj += money / 100 * 100;
money %= 100;
}
}
// cout << bg;
if (bg!=0) cout << "-" << bg;
else cout << cj*1.2+money;
}
```
by maohonghao @ 2023-11-25 10:03:27