Еднакви двойки

import java.text.DecimalFormat;
import java.util.Scanner;

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

        int count = Integer.parseInt(scanner.nextLine());

        int dif = 0;
        int maxDif = 0;

        int lastSum = 0; //3

        for (int i = 0; i < count; i++) {
            int firstNum = Integer.parseInt(scanner.nextLine());
            int secondNum = Integer.parseInt(scanner.nextLine());

            int sum = firstNum + secondNum;

            if (i > 0) {
                dif = Math.abs(sum - lastSum);
            }

            if( i > 0 && Math.abs(sum - lastSum) > maxDif){
                maxDif = Math.abs(sum - lastSum);
            }

            lastSum = sum;

        }

        if(dif == 0) {
            System.out.printf("Yes, value=%d", lastSum);
        }else{
            System.out.printf("No, maxdiff=%d", maxDif);
        }

    }
}