Bit Manipulation
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```python3 []
class Solution:
    def smallestNumber(self, n: int) -> int:
        ans = 0
        while (n):
            ans |=1
            n >>= 1
            ans <<=1
        ans >>=1
        return ans 
```
['Python3']