#include <algorithm>
#include <iostream>
#include <iomanip>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
#include <cmath>
using namespace std;

#define FOR(i,s,e) for (int i = int(s); i != int(e); i++)
#define FORIT(i,c) for (typeof((c).begin()) i = (c).begin(); i != (c).end(); i++)
#define ISEQ(c) (c).begin(), (c).end()



int main(){
	int Aw,Ab;
	int Bw,Bb;
	int C,D;
	cin >> Aw >> Ab >> Bw  >> Bb >> C >> D;

	if(Ab >= C){
		Ab -= C;
		Bb += C;
	}else{
		Bb += Ab;
		Aw -= C - Ab;
		Bw += C - Ab;
		Ab = 0;
	}
	if(Bw >= D){
		Aw += D;
	}else{
		Aw += Bw;
	}

	cout << Aw << endl;
	return 0;
}