Multiply Big Number

import java.math.BigDecimal;
import java.util.Scanner;

public class MultiplyBigInteger {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        BigDecimal firstNum = new BigDecimal(scanner.next());
        BigDecimal secondNum = new BigDecimal(scanner.next());
        BigDecimal result = firstNum.multiply(secondNum);
        System.out.println(result);
    }
}