#include<iostream>
using namespace std;
int flag=1,mom,yu;
int money=0;
int main(){
	for(int i=1;i<=12;i++){
		money=money+300;
		cin>>yu;
		if(yu>money){
			flag=0;
			cout<<"-"<<i;
			break;
		}
		mom=money/100;
		money=money%100;
	}
	if(flag==1){
		money=money+mom*100*1.2;
		cout<<money;
	}
	return 0;
}