import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.PriorityQueue;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final char[] cs = sc.next().toCharArray();
		int holes = 0;
		for(final char c : cs){
			switch(c){
			case '8':
				holes++;
			case '0': 
			case '4': 
			case '6':
			case '9':
				holes++;
			}
		}
		
		System.out.println(Math.min(2 * cs.length + holes + 1, 2 + 2 * holes + cs.length));
	}
}