import java.time.Duration;
import java.time.LocalTime;

class Main {
	
	public static void main(String[] args) {
		LocalTime t0 = LocalTime.of(14, 0);
		LocalTime t1 = LocalTime.of(13, 0);
		Duration d = Duration.between(t0, t1);
		if (d.isNegative()) {
		    d = d.plusDays(1);
		}
		System.out.println(d.toMillis());
	}
}