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# -*- coding: utf-8 -*-

class Solution:

def bitwiseComplement(self, n):

# a + _a + 1 = 2^N

if n == 0:

return 1

total = 1

number = n

while number > 0:

number = number >> 1

total = total << 1

# print(f"total {total}")

return (total - n - 1)