def main():
  from sys import stdin
  readline=stdin.readline
  n = int(readline())
  #s = input()
  #a,b = map(int, readline().split())
  #A = list(map(int, readline().split()))
  l = [n]
  while n:
    n //= 2
    l.append(n)
  tmp = sum(l)
  for i in range(len(l)-1):
    if sum(l[i+1:]) >= l[i]:
      continue
    print(sum(l[:i])+2*l[i] - tmp)
    break
main()