题解 | #求解立方根#

while True:
    try:
        n = float(input())
        a = 1/3
        if n > 0:
            result = n**a
            print(round(result, 1))
        else:
            #n-2*n 巧妙的将负数变为正数
            result = (n-2*n)**a
            print('-'+str(round(result, 1)))

    except:
        break