import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
def popcount(n):
    r = 0
    while n:
        r += n & 1
        n >>= 1
    return r
n = ni()
c = popcount(n)

print(2 ** c - 2)