import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
int b = sc.nextInt();
System.out.println((a - 1) * (b - 1) - 1);
}
}
兄弟有时间填个邀请码hhhhhhhhh(可以得AC币,邀请码在学生认证那填) 我的邀请码是:GUDFH