Factorial

Statement

In mathematics, the factorial of an integer \(n\), denoted by \(n!\) is the following product: $$n! = 1 \times 2 \times \ldots \times n$$

For the given integer \(n\) calculate the value \(n!\). Don't use math module in this exercise.

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In all the problems input the data using input() and print the result using print().