#include <iostream>
#include <cmath>

const float PI = 3.14f;

int main()
{
	float 
		b,
		a,c;
	std::cout << "a) " << pow(b, 5) / PI << std::endl;
	
	std::cin >> a >> b >> c;
	std::cout << "в) " << (a*(pow(a, 2) - b)) / (pow(b, 2) * pow(c, 2) + 1.f) << std::endl;  
}