(UVA) 10071 - Back to High School Physics - Solução

import java.io.*;
import java.util.*;
import java.lang.Math;

class Main {
    public static void main(String[] args) throws NumberFormatException, IOException {
        Main processando = new Main();
        processando.takeInput();
       
        System.exit(0);
    }
   
    void takeInput() throws NumberFormatException, IOException {
        String entrada = "";
       
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
       
        while ((entrada = br.readLine()) != null) {       
            String[] str = entrada.split(" ");

            Integer a = Integer.parseInt(str[0]);
            Integer b = Integer.parseInt(str[1]);
           
            System.out.println((a*b)*2);
        }
       
       
        return;
    }
}