#include<iostream> // std::cout, std::endl
#include<cstdio>   // getchar
#include<cmath>    // std::pow, std::abs, std::signbit
 
float f(float x)
{
    float result = -5.0f * x * x - 2.0f * x + 1.0f;
    float intermediate = std::pow(std::abs(result),1.0f/3.0f);
    if (std::signbit(result))
        return -intermediate; // Negate if 'result' is negative
    return intermediate;
}
int main()
{
    std::cout << f(-1) << std::endl;
    getchar();
    return 0;
}

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