#include<iostream>
#include<string>
#include<fstream>
#include<iomanip>
#include<vector>
#include<cctype>
#include<algorithm>
#include<sstream>
using namespace std;

int main()
{
	int n;
	double a, sum = 0, ans = 0;
	vector<double>v;
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		cin >> a;
		v.push_back(a);
		sum += a;
	}
	sum /= 10;
	for (int i = 0; i < n; i++)if (v[i] <= sum)ans += 30;
	cout << ans << endl;
	return 0;
}