题解 | #求立方根#

import  sys
import  math
for line in sys.stdin:
    a = float(line.strip())
    if a >= 0:
        ss = math.pow( a, 1/3)
        print("%.1f" % ss)
    else:
        ss = math.pow( -a, 1/3)
        print("%.1f" % -ss)
    #print(int(a[0]) + int(a[1]))