// Program 59: Display a Monthly Calendar

import java.util.*;
class MonthCalendar
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Number of days in month: ");
        int days = sc.nextInt();
        System.out.print("First weekday (Sunday=0 ... Saturday=6): ");
        int first = sc.nextInt();
        if (days < 28 || days > 31 || first < 0 || first > 6)
        {
            System.out.println("Invalid input");
            return;
        }
        System.out.println("Sun Mon Tue Wed Thu Fri Sat");
        for (int i = 0; i < first; i++)
        {
            System.out.print("    ");
        }
        for (int d = 1; d <= days; d++)
        {
            System.out.printf("%3d ", d);
            if ((first + d) % 7 == 0)
            {
                System.out.println();
            }
        }
        System.out.println();
    }
}