高精度水题..练手用╮(╯▽╰)╭
import java.io.*;
import java.util.*;
import java.math.*;
import java.text.*;
public class Main
{
public static void main(String[] args)
{
Scanner cin = new Scanner (new BufferedInputStream(System.in));
BigInteger num;
BigInteger sum;
sum = BigInteger.valueOf(0);
BigInteger ok = new BigInteger("0");
while (true)
{
num = cin.nextBigInteger();
//System.out.println(num);
if (num.compareTo(ok) == 0)
break;
sum = sum.add(num);
//System.out.println(sum);
}
System.out.println(sum);
}
}