大数加法

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

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s1 = in.nextLine();
        String s2 = in.nextLine();
        BigInteger a = new BigInteger(s1);
        BigInteger b = new BigInteger(s2);
        System.out.println(a.add(b));
    }
}