#include <iostream>

int main()
{
	int max;
	int money[100];
	std::cin >> max;

	int able = 0;

	for(int i = 0; i < max; i++)
	{
		std::cin >> money[i];
		able += money[i];
	}
	able /= 10;

	int change = 0;

	for(int i = 0; i < max; i++)
	{
		if(money[i] <= able)
		{
			change += 30;
		}
	}
	std::cout << change << std::endl;

}