#include<iostream>
#include<string>
using namespace std;

int main(){
  string n;
  cin >> n;
  int x=n.size()*2+1;
  for(int i=0;i<n.size();i++){
    switch(n[i]){
      case '4':
        x++;
        break;
      case '6':
        x++;
        break;
      case '8':
        x+=2;
        break;
      case '9':
        x++;
        break;
      default:
        break;
    }
  }
  cout << x << "\n";
  return 0;
}