import java.util.Scanner;

public class Main {

	public static void main(String args[]){

		Scanner cin = new Scanner(System.in);

		String line = cin.next();
		int count = line.length();
		int zero_count = 0;
		int eight_count =0;
		char tmp;
		int result;

		for(int i=0;i<count;i++){
			tmp = line.charAt(i);
			if(tmp == '0'||tmp=='4'||tmp=='6'||tmp=='9'){
				zero_count++;
			}else if(tmp == '8'){
				zero_count+=2;
				eight_count++;
			}
		}
		if(eight_count>0){
			result = 2*count+1+zero_count;
		}else{
			result = 2+count;
		}
		System.out.println(result);
	}
}