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# Complement of Base 10 Number (medium)

## Problem Statement

Every non-negative integer N has a binary representation, for example, 8 can be represented as “1000” in binary and 7 as “0111” in binary.

The complement of a binary representation is the number in binary that we get when we change every 1 to a 0 and every 0 to a 1. For example, the binary complement of “1010” is “0101”.

For a given positive number N in base-10, return the complement of its binary representation as a base-10 integer.

**Example 1**:

```
Input: 8
Output: 7
Explanation: 8 is 1000 in binary, its complement is 0111 in binary, which is 7 in base-10.
```

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