#include <stdio.h>
int main()
{
	int target,monthofdeath, money = 0, mom = 0, flag = 1,i;
	for(i = 0; i < 12; i++)
	{
		money += 300;
		scanf("%d", target);
		money-=target;
		if (money < 0)
		{
			flag = 0;
			monthofdeath =i;
			break;
		}
		mom+= money/100;
		money = money % 100;
	}
	if (flag == 1)
	{
		printf("%d", mom * 120);
	}
	else
	{
		printf("-%d", monthofdeath);
	}
	return 0;
}