424 Integer Inquiry(Java大数）

import java.math.*;
import java.util.Scanner;
import java.io.*;
public class Main {
	public static void main(String args[]){
		BigInteger ans = BigInteger.valueOf(0);
		BigInteger x;
		BigInteger y = BigInteger.valueOf(0);
		Scanner cin = new Scanner(System.in);
		while(true){
			 x = cin.nextBigInteger();
			 if(x.equals(y)) break;
			 ans  = ans.add(x);
		}
		System.out.println(ans);
	}
}