include [HTML_REMOVED]

using namespace std;
int main()
{
double x;
cin >> x;
double l = -10000, r = 10000;
while (r - l > 1e-8)
{
double mid = (l + r) / 2;
if (mid * mid * mid >= x)
r = mid;
else
l = mid;
}
printf(“%lf”, l);
system(“puase”);
}