import sys
input = sys.stdin.readline

N=int(input())

count=0
for i in range(61):
    if N & (1<<i) != 0:
        count+=1

if count==1:
    print(N)
else:
    ANS=0
    c=0
    for i in range(61):
        if N & (1<<i) != 0:
            c+=1
            if c==count:
                print(1<<i)
                break