#!/usr/bin/python
def Cube(x=None,y=None,z=None):
if x==None:
x=1
if y==None:
y=2
if z==None:
z=3
return (x+y-z)**3
l=Cube(3,5,1)
print l
def Cube(x=None,y=None,z=None):
if x==None:
x=1
if y==None:
y=2
if z==None:
z=3
return (x+y-z)**3
l=Cube(3,5,1)
print l
