Bus

package examPB_16Dec2018;

import java.util.Scanner;

public class Task5_Bus {
	public static void main(String[] args) {
		@SuppressWarnings("resource")

		Scanner sc = new Scanner(System.in);
		int peopleStart = Integer.parseInt(sc.nextLine());
		int stops = Integer.parseInt(sc.nextLine());

		for (int i = 1; i <= stops; i++) {
			int peopleOut = Integer.parseInt(sc.nextLine());
			int peopleIn = Integer.parseInt(sc.nextLine());
			peopleStart -= peopleOut;
			peopleStart += peopleIn;
			if (i % 2 == 1) {
				peopleStart += 2;
			} else {
				peopleStart -= 2;
			}
		}

		System.out.printf("The final number of passengers is : %d", peopleStart);
	}
}