import java.time.LocalDate;
import java.time.temporal.ChronoUnit;

public class Main {
	public static void main(String[] args) {
		String strDateStart = "2021-06-09";
		String strDateEnd = "2021-06-12";
		LocalDate dateStart = LocalDate.parse(strDateStart);
		LocalDate dateEnd = LocalDate.parse(strDateEnd);
		long days = ChronoUnit.DAYS.between(dateStart, dateEnd);
		System.out.println(days);
	}
}