#include<iostream>

#define A 30

int main() {
	int n, *c, sum = 0;
	long ans = 0;

	std::cin >> n;

	c = new int[n];
	for (int i = 0; i < n; i++) {
		std::cin >> c[i];
		sum += c[i];
	}

	sum /= 10;
	for (int i = 0; i < n; i++) {
		if (c[i] < sum) {
			ans += A;
		}
	}

	std::cout << ans << std::endl;

	delete c;

	return 0;
}