#include <iostream>
using namespace std;
int main(){
    string s;cin>>s;int m = 0;
    for(int i = 0; s.size() > i; i++){
        if(s[i] == '8')m+=2;
        if(s[i] == '0' || s[i] == '4' || s[i] == '6' || s[i] == '9')m++;
    }
    cout << min(s.size()*2+1+m,(1+m)*2+s.size()) << endl;
}