import java.util.Scanner;
public class Main {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
    Scanner input = new Scanner(System.in);
    int e = 0;
      int a[] = new int [10];
      for(int i = 0;i <10;i++) {
       a[i] = input.nextInt();
    System.out.print(" ");
      }
      int b = input.nextInt();
      for(int i = 0; i < a.length;i++) {
       if(b + 30 >= a[i]) {
        int j = 0; j++;
        e += j;
       }
      }
    System.out.println(e);
 }

}