// Program 45: Find the Past Date

import java.util.*;
class PastDate
{
    static boolean leap(int y)
    {
        return y % 400 == 0 || (y % 4 == 0 && y % 100 != 0);
    }
    static int daysInMonth(int m, int y)
    {
        int[] days = {0,31,28,31,30,31,30,31,31,30,31,30,31};
        if (m == 2 && leap(y))
        {
            return 29;
        }
        return days[m];
    }
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter date (dd/mm/yyyy): ");
        String date = sc.nextLine();
        String[] p = date.split("/");
        int d = Integer.parseInt(p[0]);
        int m = Integer.parseInt(p[1]);
        int y = Integer.parseInt(p[2]);
        System.out.print("Days before: ");
        int n = sc.nextInt();
        if (m < 1 || m > 12 || d < 1 || d > daysInMonth(m, y) || n < 0)
        {
            System.out.println("Invalid input");
            return;
        }
        for (int i = 0; i < n; i++)
        {
            d--;
            if (d == 0)
            {
                m--;
                if (m == 0) { m = 12;
                    y--;
                }
                d = daysInMonth(m, y);
            }
        }
        System.out.printf("Past date: %02d/%02d/%04d%n", d, m, y);
    }
}