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

int main(){


  int n; cin >> n;
  vector<int> v(n);
  int sum = 0;
  int an = 0;
  for (int i = 0; i < n; i++) {
    cin >> v[i];
    sum += v[i];
  }
  sum = sum / 10;
  for (int i = 0; i < n; i++) {
    if (v[i] <= sum) {
      an++;
    }
  }
  cout << an * 30 << "\n";

  return 0;
}