def H_aux(number, guess):
        if abs(guess * guess - number) < 0.00001:
                return guess
        else:
                return H_aux(number, ((guess + (number / guess)) / 2)

def H_sqr(number):
        return H_aux (number, 1.0)

y = int(input("Podaj liczbe"))

print(H_sqr(y))