import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int[] array = new int[6];

        for (int i = 0; i < 6; i++){
            array[i] = scanner.nextInt();
        }

        System.out.println((array[3] * 3600 + array[4] * 60 + array[5]) - (array[0] * 3600 + array[1] * 60 + array[2]));

    }
}