import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int all = 12 * 60 * 60;
		TreeSet<Integer> sames = new TreeSet<>();
		for (int i = 1; i <= 11; i++) {
		    sames.add(all * i / 11);
		    sames.add(all * i / 11 + all);
		}
		int second = a * 3600 + b * 60;
		System.out.println(sames.ceiling(second) - second);
	}
}