#include <iostream>
#include <algorithm>
#include <vector>
#include <array>
#include <string>
using namespace std;

int main(){
	int n;
	cin >> n;
	vector<int> data(n);
	for(auto &a:data) cin >> a;
	int sum = 0;
	for(auto a:data) sum += a;
	int ave = sum / 10;
	int count = 0;
	for(auto a:data){
		if(a <= ave) count++;
	}
	cout << 30 * count << endl;
	return 0;
}