int main() {
auto a = input("a: ");
auto b = input("b: ");
auto c = input("c: ");
if (!a) puts("Division by zero!");
else {
auto argument = pow(b, 2) + 4.0 * a * c;
if (argument < 0) puts("Invalid argument!");
else {
auto x = (b + sqrt(argument)) / (2.0 * a) - pow(a, 3) * c;
cout.setf(ios::fixed);
cout.precision(15);
cout