#include <iostream>
#include <cmath>

int main()
{
    float q = 0.0f;
    float x = 0.0f;
    float z = 0.0f;
    float res = 0.0f;

    std::cout << "Enter x: ";
    std::cin >> x;
    std::cout << "Enter z: ";
    std::cin >> z;
    std::cout << "Enter q: ";
    std::cin >> q;

    if(x > q)
    {
        res = log2f(x + 2.0f);
    }
    else
    {
        res = 3.14f / 2.0f * ((cosf(z)*cosf(z)*cosf(z)));
    }
    std::cout << "res: " << res << std::endl;
}