#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max
#include <string>	//string
#include <ios>		//fixed
#include <iomanip>	//setprecision
#include <utility> //swap
#include <cstdlib>	//abs(int)
#include <cmath>	//sqrt
#include <sstream>	//stringstream,getline
#include <cmath>	//ceil

using namespace std;

int main() {

	int N;
	cin >> N;

	vector<int> C(N);
	double sum = 0;
	int tenth = 0, ans = 0;

	for (int i = 0; i < N; i++) {
		cin >> C[i];
		sum += C[i];
	}

	tenth = ceil(sum / 10);
	for (int i = 0; i < N; i++) {
		if (C[i] <= tenth) {
			ans++;
		}
	}

	cout << ans * 30 << endl;

	return 0;

}