#include <iostream>
#include <sstream>

int main(void)
{
	double v, t;
	std::cin >> v >> t;
	
	std::stringstream ss;
	ss << v*t;

	int pos_num, decimal;
	char dot;
	ss >> pos_num >> dot >> decimal;
	// std::cout << pos_num << " " << dot << " " << decimal << std::endl;
	std::cout << pos_num << std::endl;

	return 0;
}