HDOJ题目地址：传送门

N!

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)

Total Submission(s): 74952    Accepted Submission(s): 21832

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

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Scanner;

public class Main {
   public static void main(String[] args) {
	   Scanner cin = new Scanner(System.in);
       while(cin.hasNext()){
    	   int n=cin.nextInt();
    	   BigDecimal big=new BigDecimal(1);
    	   for(int i=1;i<=n;i++){
    		   BigDecimal b= new BigDecimal(i);
    		   big=big.multiply(b);
    	   }
    	   System.out.println(big);
       }
   }
}