#include <iostream>
using namespace std;
int remain, use, get, have=0,cun[30],a，cash=0;
int main()
{
	for (int i = 1; i <= 12; i++)
	{
		cin >> cun[i];
	}
	for (int i = 1; i <= 12; i++)
	{
		have = have + 300 - cun[i];
		if (have< 0)
		{
			cout << "-" << i<< endl;
			return 0; 
		}
		else
		{
			if (have >=100)
			{
				a = have / 100;
				cash += a * 100;
				have -= a * 100;
			}
		}
	}
	cash = cash * 12 / 10;
	cout << cash << endl;

}