import java.util.*;
class A{
	static Scanner s = new Scanner(System.in);
	public static void main(String[] args) {
		int	x = s.nextInt(),
			y = s.nextInt(),
			z = s.nextInt();
		int l[] = {x+y,y+z,z+x};
		Arrays.sort(l);
		int rgb[]	= {s.nextInt(),s.nextInt(),s.nextInt()};
		Arrays.sort(rgb);
		System.out.println(
				 l[0]*rgb[2]*2
				+l[1]*rgb[1]*2
				+l[2]*rgb[0]*2);
	}
}