Problem Description
Given an integer N(0 ≤ N ≤ 10000), your task is to calculate N!

Input
One N in one line, process to the end of file.

Output
For each N, output N! in one line.

Sample Input

1
2
3

Sample Output

1
2
6

就是求n！。
懶得搞什麼字串高精度了，直接java水過去好了，話說java水這種大數真的很方便

import java.math.BigInteger;
import java.util.Scanner;
public
 
 class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in =new Scanner (System.in);
        while(in.hasNext())
        {
            int n=in.nextInt();
            BigInteger sum=BigInteger.ONE;
            for(int i=1;i<=n;i++)
            {
                sum=sum.multiply(BigInteger.valueOf(i));
            }
            System.out
 
.println(sum);
        }
    }

}