#include <iostream>
#include <string>

int nv(std::string s)
{
	if (s.size() == 1) return 1;
	if (s.size() == 2)
	{
		if (s[0] == '0' ) return 1;
		if (s[0] > '3' ) return 1;
		if (s[0] == '3')
			if(s[1] > '3') return 1;
		return 2;
	}
	
	std::string temp = s.substr(1);
	int sum = nv( temp );
	
	if ( s[0] == '0' ) return sum;
	if (s[0] > '3' ) return sum;
	if ( s[0] == '3' )
		if ( s[0] > '3' ) return sum;
		
	temp = s.substr(2);
	sum += nv( temp );
	
	return sum;
}

int main() {
	
	std::string input;
	
	std::getline(std::cin, input);
	
	std::cout << nv(input);
	
	return 0;
}