import pylab as py
from scipy import misc, arange
import matplotlib.pylab as pl
import sys
x = arange(-50, 50, 0.5)
y= input("")
def f(x):
	print('df = lambda x :')
	return x
fd = misc.derivative(f, x)
pl.plot(x,f(x))
pl.plot(x,fd)

#	pl.show()