#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[12];
	for(int i=0;i<=11;i++){
		cin>>a[i];
	}
	int yuejie=0;
	int cun=0;
	for(int i=0;i<=11;i++){
		if((300+yuejie-a[i])<0){
			printf("%d",-(i+1));
			return 0;
	    }
	    else{
	    	if((yuejie+300-a[i])>=100){
	    		cun=cun+(yuejie+300-a[i])/100;
	    		yuejie=(yuejie+300-a[i])%100;
			}
			else{
				yuejie=yuejie+300-a[i];
			}
		}
	}
	int sum=yuejie+cun*(1+0.2)*100;
	printf("%d",sum);
}