简单

#include<bits/stdc++.h>
using namespace std;
int b,m,n;
int main(){ 
	for(int i=1;i<=12;i++){
		m+=300;
		cin>>b;
		if(m-b<0){
			cout<<"-"<<i;
			return 0;
		}
		m-=b;
		n+=m/100*100;
		m%=100;
	} 
	cout<<m+(n+n*0.2);
	return 0;
}