#include <cmath>
#include <iostream>

int main()
{
	float 
		x, y, tmp;
	std::cin >> x >> y;
	
	std::cout << "f(x, y) = ";
	
	tmp = (abs(4*x*y) + 1);//избегаем ненужных вычислений
	if(pow(x, 2) > tmp)
		std::cout << log(abs(x+y)) << std::endl;
	else if(pow(x, 2) < tmp)
		std::cout << tan(1/(x*y)) << std::endl;
	else std::cout << exp(x*y + sqrt(abs(sin(x)))) << std::endl;
	
}