import java.util.*;

public class Main {
  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 d = sum / 10;
    int num = 0;
    for(int i = 0; i < N; i++) {
      if(c[i] <= d) num++;
    }
    System.out.println(num * 30);
  }
}