public class Switch
{
    public static void main(String[] args)
    {
        int month = 2, year = 2016, num = 31;
        switch (month)
        {
            case 4:
            case 6:
            case 9:
            case 11:
                num = 30;
                break;
            case 2: num = (year%4==0)?29:28;
                break;
        }
        System.out.println(month+"/"+year+":"+num+"days");

    }


}