蒟蒻写法 记得开long

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int m = sc.nextInt();
        x %= 10;
        if(x == 1){
            System.out.println((long)m);
        }else if(x == 2){
            if(m >= 3){
                System.out.println((long)m * 6);
            }else {
                for (int i = 0; i < m - 1; i++) {
                    x *= x;
                }
                x %= 10;
                System.out.println((long)x * m);
            }
        } else if (x == 3) {
            if(m >= 3){
                System.out.println((long)m);
            }else {
                for (int i = 0; i < m - 1; i++) {
                    x *= x;
                }
                x %= 10;
                System.out.println((long)x * m);
            }
        } else if(x == 4){
            if(m >= 2){
                System.out.println((long)m * 6);
            }else System.out.println((long)4 * m);
        }else if(x == 5){
            System.out.println((long)5 * m);
        }else if(x == 6){
            System.out.println((long) 6 * m);
        }else if(x == 7){
            if(m >= 3){
                System.out.println((long)m);
            }else {
                for (int i = 0; i < m - 1; i++) {
                    x *= x;
                }
                x %= 10;
                System.out.println((long)x * m);
            }
        }else if(x == 8){
            if(m >= 3){
                System.out.println((long)6 * m);
            }else {
                for (int i = 0; i < m - 1; i++) {
                    x *= x;
                }
                x %= 10;
                System.out.println((long)x * m);
            }
        }else if(x == 9){
            if(m >= 2){
                System.out.println((long)m);
            }else {
                System.out.println((long)9 * m);
            }
        }else System.out.println(0);
    }
}