#include<iostream>
using namespace std;
int main(void)
{
	double n, pa[105], sum=0;
	int i, ans = 0;
	
	cin >> n;
	for (i = 0; i < n; i++) {
		cin >> pa[i];
		sum += pa[i];
	}
	sum /= 10;

	for (i = 0; i < n; i++) {
		if (pa[i] <= sum)ans += 30;

	}
	cout << ans << endl;


	return 0;
}