#include <iostream>
using namespace std;
int main(){
	int aw,ab,bw,bb,c,d;
	cin>>aw>>ab>>bw>>bb>>c>>d;

	if(ab>=c){
		ab-=c;
		bb+=c;
	}
	else{
		c-=ab;	bb+=ab;	ab=0;
		aw-=c;	bw+=c;
	}

	if(bw>=d){
		aw+=d;
	}
	else{
		aw+=bw;
	}
	cout<<aw<<endl;
	return 0;
}