import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int[] num = new int[10];
    int r = 0;
    for(int i = 0; i < 10; i++) {
      int d = n % 10;
      num[d]++;
      r++;
      n /= 10;
      if(n == 0) break;
    }
    int ana = 0;
    for(int i = 0; i < 10; i++) {
      if((i == 0) || (i == 4) || (i == 6) || (i == 9)) ana += (num[i]);
      if(i == 8) ana += (2 * num[i]);
    }
    int ans1 = 2 * r + 1 + ana;
    int ans2 = r + (2 * ana) + 2;
    int ans = Math.min(ans1, ans2);
    System.out.println(ans);
  }
}