#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main() {
	int i, j, k;
	long n;
	vector<long>c;
	long sum = 0;

	cin >> n;

	for (i = 0; i < n; i++) {
		long num;
		cin >> num;
		c.push_back(num);
		sum += num;
	}

	long yu = sum / 10;
	int cnt = 0;

	for (i = 0; i < n; i++) {


		if (yu >= c[i]) {
			cnt++;
		}

	}

	cout << cnt * 30 << endl;




	getchar();
	getchar();
	return 0;
}