#include "bits/stdc++.h"
using namespace std;

int main () {
	int a[13], n, c, m = 0;
	float f;
	for(int i = 0; i < 12; i++){
		cin >> a[i];
	}
	for(int i = 0; i < 12; i++){
		n += 300;
		n -= a[i];
		if(n < 0){
			printf("-%d", i + 1);
			return 0;
		}else{
			if(n >= 100){
				c = n / 100 * 100;
				n -= c;
				m += c;
			}
		}
	}
	f = n + m * 1.2;
	printf("%g", f);
	system ( "pause" );
	return 0;
}