#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)

int main(){
	int aw,ab,bw,bb,c,d;
	cin>>aw>>ab>>bw>>bb>>c>>d;
	int mw,mb;
	
	if(c<=ab){mw=0; mb=c;}
	else {mw=-(c-ab); mb=ab;}

	aw+=mw; bw-=mw;
	ab+=mb; bb-=mb;
	
	if(d<=bw){mw=d; mb=0;}
	else {mw=bw; mb=-(d-bw);}

	aw+=mw; ab+=mb;
	
	cout<<aw<<endl;
}