算法训练 阶乘

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

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc=new Scanner(System.in);
        while(sc.hasNext()){
            int n=sc.nextInt();
            BigInteger s = BigInteger.ONE;
            for(int i=1;i<=n;i++){
                s=s.multiply(BigInteger.valueOf(i));
            }
            String s1=""+s;
            for(int i=s1.length()-1;i>=0;i--){
                if(s1.charAt(i)!=‘0‘){
                    System.out.println(s1.charAt(i));
                    break;
                }
            }
        }

    }

}