import bisect
import copy
import decimal
import fractions
import heapq
import itertools
import math
import random
import sys
from collections import deque,defaultdict
from functools import lru_cache,reduce
from heapq import heappush,heappop,heapify,_heappop_max,_heapify_max
def _heappush_max(heap,item):
    heap.append(item)
    heapq._siftdown_max(heap,0,len(heap)-1)
from math import gcd as Gcd
read=sys.stdin.read
readline=sys.stdin.readline
readlines=sys.stdin.readlines

N=int(readline())
if N==0:
    ans=4
else:
    ans=pow(3,N)/pow(4,N-1)
print(ans)