1025: 求n的阶乘

Memory Limit:128 MB Time Limit:1 S
Judge Style:Text Compare Creator:
Submit:1144 Solved:844

Description

输入一个正整数n,求n的阶乘(n!=1*2*3*...*n)

Input

输入一个正整数

Output

输出n!的值

Sample Input Copy

3

Sample Output Copy

6

HINT

结果在int范围内

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