```c
#include<bits/stdc++.h>
using namespace std;
int a[12];
int main(){
int sum=0;
for(int i=1;i<=12;i++){
cin>>a[i];
}
for(int i=1;i<=12;i++){
a[i]=300-a[i]+a[i-1];
if(a[i]>=100){
sum+=a[i];
a[i]%=100;
sum-=a[i];
}else if(a[i]<0){
cout<<-i;
return 0;
}
}
cout<<a[12]+sum*1.2;
return 0;
}
```
by JNTM114514 @ 2022-08-09 22:23:49