document.write('
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  1. import java.util.*;
  2. public class uva10071 {
  3.     public static void main(String [] args) {
  4.         Scanner scn = new Scanner(System.in);
  5.         while(scn.hasNextInt()) {
  6.             int n = scn.nextInt();
  7.             int m = scn.nextInt();
  8.             System.out.println(n*(m*2));
  9.         }
  10.     }
  11. }
');