from __future__ import division

print 1/2 # normal division
print 1//2 # int division
print 1.0//2.0 # int division

print 5/2, round(5/2), 5%2, -5**2, -abs(pow(5, 2))

import math
print math.ceil(21.111), math.floor(21.111), int(math.floor(21.111))

from math import sqrt
print sqrt(9) #sqrt(-9)

import cmath
print cmath.sqrt(-9), sqrt(9)

from cmath import sqrt
print sqrt(-9), sqrt(9)