#include<iostream>
#include<sstream>
#include<cstdio>
#include<cstring>
#include<string>
#include<vector>
#include<list>
#include<queue>
#include<utility>
#include <fstream>
#include<set>
#include<map>
#include<cctype>
#include<cmath>
#include<algorithm>
using namespace std;


#define RALL(x) (x).rbegin(),(x).rend()
#define ALL(x) (x).begin(),(x).end()
#define repp(i,n) for(int (i)=1;(i)<=(n);(i)++)
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define rev(i,n) for(int (i)=(n-1);(i)>=0;(i)--)
#define clr(a) memset((a), 0 ,sizeof(a))

typedef pair<int,int> P;
typedef vector<pair<int,string> > pii;
typedef map<string,int> mdi;


int A[3],B[3];

int main(){
	cin >> A[0] >> A[1] >> A[2] >> B[0] >> B[1] >> B[2];
	sort(A,A+3);
	sort(B,B+3,greater<int>());
	cout << (2*A[0]+2*A[1])*B[0] + (2*A[0]+2*A[2])*B[1] + (2*A[1]+2*A[2])*B[2] << endl;
	return 0;
}