How many natural numbers less than 1000 can be formed form the digits ` 0,1,2,3,4,5` when a digit may be repeated any number of times?

Explanation

To solve the problem of how many natural numbers less than 1000 can be formed from the digits 0, 1, 2, 3, 4, and 5, where digits may be repeated, we can break it down step by step.

### Step-by-step Solution:

1. **Understanding the Range**:
We need to find natural numbers that are less than 1000. This means we can have 1-digit, 2-digit, or 3-digit numbers.

2. **Counting 1-digit Numbers**:
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