#include<bits/stdc++.h>
using namespace std;
int tol,now,x;
int main(){
	for(int i=1;i<=12;i++){
		now+=300;
		cin>>x;
		now-= x;
		if(now<0){
			cout<<"-"<<i;
            return 0;
		}
		while(now>=100){
			tol+= 100; 
			now-= 100;
		}
	}
	cout<<now+tol*1.2;
	return 0;
}