4452 - Factorial

Time Limit: 1s Memory Limit: 128MB

Submissions: 131 Solved: 65
Description

Factorial의 값을 찾아라.

Input

* Line 1 : i (0~20 범위의 정수)

Output

* Line 1 : i!의 값

Sample Input
20
Sample Output
2432902008176640000
Source

c자료구조2장