#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main(void) {
    string s;
    cin >> s;
    int black = s.size();
    int white = 1;
    for (int i = 0; i < s.size(); i++) {
        switch((int)s[i] - 48) {
            case 0: white++; break;
            case 4: white++; break;
            case 6: white++; break;
            case 8: white+=2; break;
            case 9: white++; break;
        }
    }
    cout << min(white * 2 + black, white + black * 2) << endl;
    return 0;
}