1 package com.gtja.gmall.eplusmall.entity;
2
3 import java.math.BigDecimal;
4 import java.util.Scanner;
5
6 /**
7 * Created by CP_wangchao on 2017/6/21.
8 */
9 public class Test {
10 public static void main(String arg[]){
11 Scanner scanner = new Scanner(System.in);
12 int index = scanner.nextInt();
13 System.out.print(fun(index));
14 }
15
16 public static BigDecimal fun(long index){
17
18 BigDecimal sum = new BigDecimal("1");
19 for(int i=1;i<=index;i++){
20 sum = sum.multiply(new BigDecimal(String.valueOf(i)));
21 }
22 return sum;
23 }
24 }
