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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from typing import List
def count_different_bits(a: int, b: int) -> int:
count = 0
while a > 0 or b > 0:
count += (a % 2) ^ (b % 2)
a >>= 1
b >>= 1
return count
def sum_different_bits(numbers: List[int]) -> int:
total = 0
for i in range(len(numbers)):
for j in range(i+1, len(numbers)):
total += count_different_bits(numbers[i], numbers[j])
return total
if __name__ == "__main__":
input_list = [2, 3, 4]
result = sum_different_bits(input_list)
print(result)
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