import java.util.*;

public class Exercise92{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int[] c = new int[n];
    int sum = 0;

    for(int i = 0; i < n; i++){
      c[i] = sc.nextInt();
      sum += c[i];
    }

    int count = 0;

    for(int i = 0; i < n; i++){
      if(c[i] <= sum / 10){
        count++;
      }
    }
    System.out.println(30 * count);
  }
}