大数的加减乘除

import java.math.BigInteger;
import java.util.*;

public class Main {
    public static void main(String[] args)
    {
        Scanner in=new Scanner(System.in);
        while(in.hasNextBigInteger())
        {
            BigInteger a=in.nextBigInteger();
            BigInteger b=in.nextBigInteger();
            System.out.println(a.add(b));
        }
    }
}