Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given an integer n, return true if it is a power of two. Otherwise, return false.
An integer n is a power of two, if there exists an integer x such that n == 2x.
 
Please complete the following python code precisely:
```python
class Solution:
    def isPowerOfTwo(self, n: int) -> bool:
```