Emrakul

import sys

def power2(num):
    counter = 0
    while num > 1:
        counter += 1
        num = num // 2
    return counter

N = int(input())
first = int(input())
second = int(input())
if first < second:
    second, first = first, second
diff = power2(first) - power2(second)
if diff > 0:
    for i in range(diff):
        first = first // 2
while True:
    if first == second:
        print(first)
        sys.exit()
    first = first // 2
    second = second // 2