#include<bits/stdc++.h>
using namespace std;
#ifdef LOCAL_DEBUG
  #include "LOCAL_DEBUG.hpp"
#endif
#define int long long

signed main(){

  int n; cin >> n;

  int ans = 1, cnt = 0;;
  while(n > 0){
    if(n % 10 == 6 || n % 10 == 9 || n % 10 == 0 || n % 10 == 4) ans++;
    if(n % 10 == 8) ans += 2;
    n /= 10;
    cnt++;
  }
  cout << ans + cnt * 2 << endl;

  return 0;
}