#include<iostream>
using namespace std;

int main()
{
	int out, left, store, sum, tr, month;
	left = 0;
	sum = 0;
	tr = 0;
	for (int i = 1; i <= 12; i++)
	{
		cin >> out;
		store = ((left + 300 - out) / 100) * 100;
		sum = store + sum;
		left = left + 300 - out - store;
		if (left + 300 - out < 0)
		{
			tr = 1;
			month = i;
			break;
		}
	}
	if (tr == 1)
	{
		cout << "-" << month;
	}
	else
	{
		sum = left + (sum * 6) / 5;
		cout << sum;
	}
	return 0;
}