1180: 计算n!

Memory Limit:32 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:50 Solved:34

Description

计算n!
n!= 1*2*3*4*... *n
例如 5!=1*2*3*4*5

Input

输入一个正整数n

Output

n!的结果

Sample Input Copy

5

Sample Output Copy

120

HINT

n<10;

Source/Category