#include <iostream>
using namespace std;

int q;
int h[13];
int money=0;
int a;
int main() {
	for (int i = 1; i <= 12; i++)
	{
		cin >> h[i];
	}
	for (int j = 1; j <= 12; j++)
	{
		q += 300;
		q -= h[j];
		if (q < 0)
		{
			cout << "-" << j;
			return 0;
		}
		if (q>=100) {
			a = q / 100;
			money += a * 100;
			q -= a * 100;

		}

	}
	cout << (q+money)*1.2;

	return 0;

}