// Program 30: Difference Between Two Dates

import java.util.*;
class DateDifference {
    static boolean leap(int y) {
        return y % 400 == 0 || (y % 4 == 0 && y % 100 != 0);
    }
    static int monthDays(int m, int y) {
        int[] days = {31,28,31,30,31,30,31,31,30,31,30,31};
        if (m == 2 && leap(y)) {
            return 29;
        }
        return days[m - 1];
    }
    static boolean valid(int d, int m, int y) {
        return y >= 1 && m >= 1 && m <= 12 && d >= 1 && d <= monthDays(m, y);
    }
    static long serial(int d, int m, int y) {
        long years = y - 1;
        long total = 365 * years + years / 4 - years / 100 + years / 400;
        for (int i = 1; i < m; i++) {
            total += monthDays(i, y);
        }
        return total + d;
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int d1 = sc.nextInt();
        int m1 = sc.nextInt();
        int y1 = sc.nextInt();
        int d2 = sc.nextInt();
        int m2 = sc.nextInt();
        int y2 = sc.nextInt();
        if (!valid(d1, m1, y1) || !valid(d2, m2, y2)) {
            System.out.println("Invalid date");
            return;
        }
        long difference = serial(d1, m1, y1) - serial(d2, m2, y2);
        if (difference < 0) {
            difference = -difference;
        }
        System.out.println("Days = " + difference);
    }
}