#include <bits/stdc++.h>
using namespace std;
const set<int> st = {0, 4, 6, 9};

int main() {


	int n;
	cin >> n;
	int ans = 1;
	while (n) {
		ans += 2;
		int cd = n % 10;
		if (st.count(cd)) ans++;
		else if (cd == 8) ans += 2;
		n /= 10;
	}
	cout << ans << endl;
	return (0);
}