HDU 1047 Integer Inquiry

import java.io.*;
import java.math.*;
import java.util.*;
import java.text.*;
public class Main
{
public static void main(String[] args)
{
Scanner cin=new Scanner (new BufferedInputStream(System.in));
BigInteger sum,a;
int n=cin.nextInt();
for(int i=0;i<n;i++)
{
sum=BigInteger.valueOf(0);
while(cin.hasNext())
{
a=cin.nextBigInteger();
if(a.equals(BigInteger.valueOf(0)))
break;
sum=sum.add(a);
}
System.out.println(sum);
if(i!=n-1)System.out.println();
}
}
}