#include<iostream>
#include<cstdio>
using namespace std;
int n,nmoney = 0,months[20];
float s = 0;
int main(){
	for(int i = 1; i <= 12; i++){
		scanf("%d",&months[i]);
	}
	for(int i = 1; i <= 12; i++){
		nmoney += 300;
		if(nmoney >= months[i]){
			nmoney -= months[i];
		}else{
			printf("-%d",i);
			return 0;
		}
		while(nmoney >= 100){
			nmoney -= 100;
			s += 100;
		}
	}
	s += nmoney;
	printf("%.0f",s * 6 / 5); 
	return 0;
}