#include <iostream>
using namespace std;
int main(int argc, char* argv[])
{
	int L1,L2,L3;
	int R,B,Y;
	cin>>L1>>L2>>L3;
	cin>>R>>B>>Y;
	int rb=2*(R+B);
	int ry=2*(R+Y);
	int by=2*(B+Y);
	int MaxL=max(L1,max(L2,L3));
	int MinL=min(L1,min(L2,L3));
	int MidL=L1+L2+L3-MaxL-MinL;

	int MaxRBY=max(rb,max(ry,by));
	int MinRBY=min(rb,min(ry,by));
	int MidRBY=rb+ry+by-MaxRBY-MinRBY;

	cout<<MinRBY*MaxL+MaxRBY*MinL+MidRBY*MidL<<endl;
	return 0;
}