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Time limit 1000/1000/1000/1000 ms. Memory limit 65000/65000/65000/65000 Kb.
Problem description
The factorial of a non-negative integer n is the product of the positive integers
less than or equal to n. This is written as "n!", and pronounced "n factorial". 0!=1,
1!=1, 2!=2, 3!=6, 4!=24, 5!=120. Write a program that reads a non-negative
integer from the standard input and computes its factorial.
Input
There is a single integer N on the first line of input (0 ≤ N ≤ 20).
Output
Write value of N!.
Example
Для отправки решений необходимо выполнить вход.
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