#include <iostream>
#include <vector>

using namespace std;

int main() {
  int n, kyou=0, sum=0, wari;
  cin >> n;
  vector<int> v(n);
  
  for (int i=0; i<n; i++) {
    int t;
    cin >> t;
    v[i]=t;
    sum+=t;
  }

  wari=sum/10;
  
  for (int i=0; i<n; i++) {
    if (v[i]<=wari) kyou++;
  }

  cout << kyou*30 << endl;
  return 0;
}