考研机试 24.N的阶乘

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

public class Main{
    
    public static void main(String[] args){
        
        Scanner in = new Scanner(System.in);
        
        while(in.hasNext()){
            //读取输入
            int n = in.nextInt();
            BigInteger count = new BigInteger("1");
            
            //计算阶乘
            for(int i = 2; i <= n; i++){
                count = count.multiply(new BigInteger("" + i));
            }
            
            //输出结果
            System.out.println(count);
        }
    }
}