POJ2389大数相乘

import java.util.Scanner;
import java.math.BigDecimal;
import java.math.BigInteger;
public class Main
{
public static void main(String[]args)
{
Scanner cin=new Scanner(System.in);
while(cin.hasNextBigInteger())
{
BigInteger a;
BigInteger b;
a=cin.nextBigInteger();
b=cin.nextBigInteger();
System.out.println(a.multiply(b));
}
}
}