import java.util.Scanner;

public class Test2 {

	public static void main(String[] args) {
		// 编写程序实现，输入年份和月份，输出该月的天数。
		//（提示：能被4整除且不被100整除，或者能被400整除的年份就是闰年。）
		
		Scanner scan = new Scanner(System.in);
		System.out.print("请输入年份：");
		int year = scan.nextInt();
		System.out.print("请输入月份：");
		int month = scan.nextInt();

		switch(month) {
	     	case 1:
	     	case 3:
	     	case 5:
	     	case 7:
	     	case 8:
	     	case 10:
	     	case 12:
	     		System.out.print(year+"年"+month+"月有31天");
	     		break;
	     		
	     	case 4:
	     	case 6:
	     	case 9:
	     	case 11:
	     		System.out.print(year+"年"+month+"月有30天");
	     		break;
	     		
	     	case 2:
	     		if(（year % 4 == 0&& year % 100 !=0 ） || year % 400 == 0) 
	     			System.out.print(year+"年"+month+"月有29天");
	     		else 
	     			System.out.print(year+"年"+month+"月有28天");
	     		break;
	     		
	     		default:
	     			System.out.println("您的输入有误！");
	     		break;
		}
		
	}
}