from sys import stdin
pin=stdin.readline
def main():
  N=int(pin())
  n=str(bin(N))[2:]
  c1=0
  c2=0
  for i in range(len(n)):
    if n[i]=="1":
      c1=i
      break
  #for i in range(len(n)-1,-1,-1):
  #  if n[i]=="1":
  #    c2=i
  #    break
  ans=["0"]*len(n)
  ans[c1]="1"
  #ans[c2]="1"
  print(int("0b"+"".join(ans),2))
  return

main()