#include <iostream>
#include <cmath>

int main()
{
	float x, m;
	std::cin >> x;
	
	std::cout << "а) " << tan(pow(x, 3) / 4) << std::endl;
	
	std::cin >> x >> m;
	std::cout << "в) " << log10(x) / 3.4f*m << std::endl;
	 
}