#include <iostream>
using namespace std;

int main(){
  int N;
  cin >> N;
  int C[N], basis = 0, result = 0;
  for(int i = 0; i < N; i++){
    cin >> C[i];
    basis += C[i];
  }
  basis /= 10;
  for(int i = 0; i < N; i++){
    if(C[i] <= basis)
      result++;
  }
  cout << result * 30 << endl;
}