import sys,math
def usage():
	print 'You should supply 1 or 2 numbers'
l = len(sys.argv)
if (l>3 or l<2):
	usage()
else:
	x = float(sys.argv[-1])
	b = 2
	if l == 3:
		b = float(sys.argv[-2])
	print 'The log of ', x,' to base ',b,' is ', math.log(x,b)