import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int L1 = sc.nextInt();
        int L2 = sc.nextInt();
        int L3 = sc.nextInt();
        int [] L = {L1+L2,L2+L3,L3+L1};
        int [] RBY = new int [3];
        for(int i=0; i<3; i++){
            RBY[i] = sc.nextInt();
        }
        Arrays.sort(L);
        Arrays.sort(RBY);
        int min=0;
        for(int i=0; i<3; i++){
            min+=RBY[i]*L[2-i];
        }
        System.out.println(2*min);
    }
}