Prove that $p\le x<p+1$ by well ordering property

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by using well ordering property prove that if $x$ is a positive real number then there exist unique integer $p\ge0$ such that $p\le x<p+1$.

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Hint:

The set of positive integers $n$ with $x<n$ is not empty.

What conclusion can be drawn from this on base of the fact that $\mathbb N$ is well- ordered?