题解 | 小美的梯子

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        if (a == 0 || b == 0) {
            System.out.print(0);
        } else if (a > b) {
            System.out.print(b);
        } else if (a <= b) {
            System.out.print(a - 1);
        }
    }
}