package yukicoder;
import java.util.Arrays;
import java.util.Scanner;
public class Main{
	public static void main(String[] args)throws Exception{
		new Main().solve();
	}
	void solve(){
		Scanner sc=new Scanner(System.in);
		int[] l=new int[3];
		for(int i=0;i<3;i++)l[i]=sc.nextInt();
		int[] d=new int[3];
		for(int i=0;i<3;i++)d[i]=sc.nextInt();
		Arrays.sort(d);
		
		int s_sum=l[0]+l[1]+l[2];
		for(int i=0;i<3;i++)l[i]=2*(s_sum-l[i]);
		Arrays.sort(l);
		int ans=0;
		for(int i=0;i<3;i++)ans+=l[i]*d[2-i];
		System.out.println(ans);
	}
}