#include <bits/stdc++.h>
using namespace std;
int main()
{
	string n;
	cin >> n;
	int sum = 0;
	for(int i = 1; i <= n.length(); i++)
	{
		if(n[i] == '2' || n[i] == '6' || n[i] == '9' || n[i] == '0')
		{
			sum += 1;
		}
		if(n[i] == '8')
		{
			sum += 2;
		}
		else
		{
			continue;
		}
	}
	cout << sum;
	return 0;	
}