高精度

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