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);}}