```
#include<bits/stdc++.h>
using namespace std;
int main(){
int a=0,n,c,d=0;
for(int i=1;i<=12;i++){
cin>>n;
if(a+300>=n){
c=a+300-n;
a=c%100;
d=d+c-a;
}
else{
cout<<-i;
return 0;
}
}
cout<<d*1.2+a;
return 0;
}
```cpp
by MC00101 @ 2023-06-28 19:19:01
代码如上
by MC00101 @ 2023-06-28 19:19:45