#include <iostream>
#include <vector>
int main() {
	int n;
	std::cin >> n;
	std::vector<int> vector(n);
	int sum = 0;
	for (auto &v : vector) {
		std::cin >> v;
		sum += v;
	}
	sum /= 10;
	int money = 0;
	for (const auto &v : vector) {
		if (v <= sum) {
			++money;
		}
	}
	std::cout << money * 30 << std::endl;
	return 0;

}