#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)

int main(){
  int N, a, ave;
  int sum = 0;
  int kyo = 0;
  vector<int> voted;
  
  //入力
  cin >> N;
  rep(i,N){
    cin >> a;
    sum += a;
    voted.push_back(a);
  }
  //calculate average score.
  ave = sum / 10;
  rep(i,N){
    //cout << voted[i] << endl;
    if(voted[i] <= ave){
      kyo += 30;
    }
  }
  
  cout << kyo << endl;
  
}