300330: CF64A. Factorial

Memory Limit：64 MB Time Limit：2 S
Judge Style：Text Compare Creator：
Submit：0 Solved：0

Description

A. Factorialtime limit per test2 secondsmemory limit per test64 megabytesinputstandard inputoutputstandard output

Print the factorial of the given integer number n. The factorial of n is equal to 1·2·...·n.

Input

The only line contains n (1 ≤ n ≤ 10).

Output

Print the factorial of n.

ExamplesInput
3
Output
6
Input
5
Output
120

Input

Source/Category

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