#!/bin/python3

import sys

def sumOfGroup(k):
    inp = []
    i=1
    see = (2**k)-1
    a=see
    inp.append(see)
    while i<k:
        a=a+2
        inp.append(a)
        i=i+1
    print(sum(inp))
  
    
    # Return the sum of the elements of the k'th group.

if __name__ == "__main__":
    k = int(input().strip())
    sumOfGroup(k)