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;
		char tmp;
		int result=0;

		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;
			}
		}

		result = 2*count+1+zero_count;
		System.out.println(result);
	}
}