#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    string s;
    cin >> s;
    int n = s.length();
    int a = 0;
    for ( int i = 0; i < n; i++ ) {
        if ( s[i] == '0' || s[i] == '4' || s[i] == '6' || s[i] == '9' ) {
            a++;
        }
        else if ( s[i] == '8' ) { a += 2; }
    }

    if ( n < a+1 ) {
        cout << n*2+a+1 << endl;
    }
    else {
        cout << (a+1)*2+n << endl;
    }

    return 0;
}