#include<bits/stdc++.h>
using namespace std;
int s1,s2,s3,s4,timex,sumz=0,sumy=0,sum=0;
int main(){
	cin>>s1>>s2>>s3>>s4;
	sumz=sumy=0;
	for(int i=1;i<=s1;++i){
		cin>>timex;
		if(sumz<=sumy) sumz+=timex;
		else sumy+=timex;
	}
	sum+=max(sumz,sumy);
	sumz=sumy=0;
	for(int i=1;i<=s2;++i){
		cin>>timex;
		if(sumz<=sumy) sumz+=timex;
		else sumy+=timex;
	}
	sum+=max(sumz,sumy);
	sumz=sumy=0;
	for(int i=1;i<=s3;++i){
		cin>>timex;
		if(sumz<=sumy) sumz+=timex;
		else sumy+=timex;
	}
	sum+=max(sumz,sumy);
	sumz=sumy=0;
	for(int i=1;i<=s4;++i){
		cin>>timex;
		if(sumz<=sumy) sumz+=timex;
		else sumy+=timex;
	}
	sum+=max(sumz,sumy);
	sumz=sumy=0;
	cout<<sum<<endl;
	return 0;
}