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

int main(){
	int a=1,x,y,len;
	string s;
	cin >> s;
	len=s.size();
	for(int i=0;i<len;i++){
		if(s[i]=='8') a+=2;
		else if(s[i]=='0'||s[i]=='4'||s[i]=='6'||s[i]=='9') a++;
	}
	
	cout << min(2*len+a, 2*a+len) << endl;
	return 0;
}