import java.util.*;

public class Exercise83{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);
    Integer[] box = new Integer[3];
    Integer[] ribbon = new Integer[3];
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    for(int i = 0; i < ribbon.length; i++){
      ribbon[i] = sc.nextInt();
    }
    box[0] = a + b;
    box[1] = a + c;
    box[2] = b + c;

    Arrays.sort(box, Comparator.naturalOrder());
    Arrays.sort(ribbon, Comparator.reverseOrder());
    
    int sum = 0;
    for(int i = 0; i < box.length; i++){
      sum += box[i] * 2 * ribbon[i];
    }

    System.out.println(sum);
  }
}