#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	string s;
	cin >> s;
	int len = (int)s.length();
	int hole = 0;
	for(int i = 0; i < len; i++) {
		int a = s[i] - '0';
		if(a == 0 || a == 6 || a == 9 || a == 4) hole++;
		if(a == 8) hole += 2;
	}
	cout << min(len * 2 + hole + 1, (hole + 1) * 2 + len) << endl;
	return 0;	
}