Equal Pairs

import java.util.Scanner;

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

        int num = Integer.parseInt(scanner.nextLine());
        int sum = 0;
        int maxDiff = 0;
        int lastSum = 0;
        int counter = 1;

        for (int i = 1; i <= num; i++) {
            int n1 = Integer.parseInt(scanner.nextLine());
            int n2 = Integer.parseInt(scanner.nextLine());

            sum = n1 + n2;
            if (sum == lastSum){
                counter++;
            }
            if (i > 1){
                int currentDiff =Math.abs( lastSum - sum);
                if (currentDiff>maxDiff){
                    maxDiff = currentDiff;

                }
            }
            lastSum = sum;


        }if (counter == num){
            System.out.printf("Yes, value=%d",sum);

        }else{

            System.out.printf("No, maxdiff=%d", maxDiff);

        }
    }
}