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#include <iostream>
#include <string>
using namespace std;
 
double safeInputDouble(string prompt) { // Using <iostream>, <string>
    double result;
    string input;
    while (true) {
        try {
            std::cout << prompt;
            std::cin >> input;
            result = stod(input);
            return result; // If no exception was thrown, input is successful
        }
        catch (exception& e)
        {
            std::cin.clear();
            cout << "Input value is incorrect, try again" << endl;
        }
    }
    
}
 
double math_function(double argument_x, double argument_a, double argument_c) {
    const double coefficient = 7.1e-16;
 
    double result;
    // First part of y(x) calculating
    result = -pow(-log(abs(cos(argument_x))), 1.0 / 3) + coefficient;
    if (isinf(result)) {
        throw std::invalid_argument("log(0) doesn't exist at log(abs(cos(x)))");
    }
    // Second part
    result += argument_a / (argument_x + argument_c);
    if (isinf(result)) {
        throw std::invalid_argument("Attempt to divide by 0 at a/(x+c)");
    }
    // Last part
    result += 1.0 / tan(argument_x);
    if (isinf(result)) {
        throw std::invalid_argument("ctg(x) doesn't exist");
    }
 
    return result;
}
 
int main() {
    // Task 2, variant 8
    setlocale(LC_ALL, "rus");
    double y;
    double x = safeInputDouble("x = ");
    double a = safeInputDouble("a = ");
    double c = safeInputDouble("c = ");
    
    try {
        y = math_function(x, a, c);
    }
    catch (std::invalid_argument error) {
        cout << error.what();
        return 1;
    }
    
    printf("y(%.3lf) = %.3lf", x, y);
    return 0;
}

cout << "y=" << y << "\n";