大数求和（A+B） JAVA

import java.util.Scanner;
import java.math.BigInteger;
public class Main {
public static void main(String[] args){
BigInteger a,b;
Scanner cin = new Scanner(System.in);
while(cin.hasNext()){
a = cin.nextBigInteger();
b = cin.nextBigInteger();
System.out.println(a.add(b));
}
}
}