#include <iostream>

int main() {
	double v, t;
	std::cin >> v >> t;
	const auto magTemp = 10000ul;
	auto v1 = static_cast< unsigned long >( magTemp * v );
	auto t1 = static_cast< unsigned long >( magTemp * t );
	std::cout << ( v1 * t1 ) / magTemp << std::endl;
	return 0;
}