Simplify 2016 and 2015 factorial!

Algebra Level 1

$\dfrac{2016^{2016}}{\underbrace{2016!\times2016!\times2016!\times\cdots\times2016!}_{2016 \text{ times}}}\times\underbrace{2015!\times2015!\times2015!\times\cdots\times2015!}_{2016 \text{ times}}$

Simplify the expression above.

Notation: $!$ denotes the factorial notation. For example, $8! = 1\times2\times3\times\cdots\times8$ .

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