d=int(input())
ans=d
for i in range(1,61):
	q,w=0,1<<60
	while w-q>1:
		m=(q+w)//2
		c=m;f=0
		for i in range(i+1):
			f+=c;c//=2
		if f<d:
			q=m
		else:
			w=m
	c=w;f=0
	for i in range(i+1):
		f+=c;c//=2
	if  f==d:
		ans=min(ans,w)
print(ans)