d=int(input());a=d
for k in range(65):
 l,r=0,d
 while r-l>1:
  m=(l+r)//2;s=0;x=m
  for i in range(k):s+=x;x//=2
  if s<d:l=m
  else:r=m
 s=0;x=r
 for i in range(k):s+=x;x//=2
 if s==d:a=min(a,r)
print(a)