'''For Example, consider the given series: 1, 1, 2, 3, 4, 9, 8, 27, 16, 81, 32, 243, 64, 729, 128, 2187....
This series is a mixture of 2 series – all the odd terms in this series form a geometric series and all the even terms form yet another geometric series.
Write a program to find the Nth term in the series.'''
n=int(input())
if(n%2==0):
	n=n//2
	n=n-1
	print(3**n)
else:
	n=n//2
	print(2**n)