DaySum

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.Scanner;

public class P11_Date {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());

        String firstDate = scanner.nextLine();
        String secondDate = scanner.nextLine();

        DateTimeFormatter format = DateTimeFormatter.ofPattern("dd-MM-yyyy");

        int firstCount = 0;
        int secondCount = 0;
        for (int i = 1; i <= n; i++){

            if (i % 2 == 0){
                firstCount ++;
            } else {
                secondCount ++;

            }
        }
        LocalDate first = LocalDate.parse(firstDate, format).plusDays(firstCount);
        LocalDate second = LocalDate.parse(secondDate, format).plusDays(secondCount);

        int firstDays = first.getDayOfMonth();
        int secondDays = second.getDayOfMonth();

        System.out.println(firstDays + secondDays);
    }
}