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Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.

**Note:**

- The given integer is guaranteed to fit within the range of a 32-bit signed integer.
- You could assume no leading zero bit in the integerâ€™s binary representation.

**Example 1:**

Input:5Output:2Explanation:The binary representation of 5 is 101 (no leading zero bits), and its complement is 010. So you need to output 2.

**Example 2:**

Input:1Output:0Explanation:The binary representation of 1 is 1 (no leading zero bits), and its complement is 0. So you need to output 0.

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