import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String s = scan.next();
		scan.close();
		int l = s.length();
		int k1 = 0;
		for(int i = 0; i < l; i++) {
			char c = s.charAt(i);
			if(c == '1' || c == '2' || c == '3' || c == '5' || c == '7') {
				continue;
			}else if(c == '4' || c == '6' || c == '9' || c == '0') {
				k1++;
			}else {
				k1 += 2;
			}
		}
		int min = Math.min(2 * l + k1 + 1, 2 * (k1 + 1) + l);
		System.out.println(min);
	}
}