View Code of Problem 1

import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        while (scanner.hasNext()){
            BigInteger a,b;
            a=scanner.nextBigInteger();
            b=scanner.nextBigInteger();

            System.out.println(a.add(b));
        }

    }
}