Smallest Number with All set Bits - python3 
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:

        if n == 1:
            return 1

        num = 2
        for i in range(n):
            if 2 ** i - 1 >= n:
                return 2 ** i - 1

```
['Python3']