#include <iostream>
#include <iomanip>

#include <algorithm>
#include <math.h>

#include <string>
#include <list>
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed;//
    //cout << setprecision(6);//

    int Aw,Ab,Bw,Bb,C,D;
	cin>>Aw>>Ab>>Bw>>Bb>>C>>D;

	int tempW,tempB;
	//C
	if(Ab < C){
		tempB = Ab;
		Ab    = 0;//Ab-tempB
		tempW = C - tempB;
		Aw    = Aw - tempW;
		Bw += tempW;
		Bb += tempB;
	}else{
		tempB = C;
		Ab    = Ab - tempB;
		Bb	 += tempB;
	}

	//D
	if( Bw < D){
		cout << Aw + Bw << endl;
	}else{
		cout << Aw + D << endl;
	}
    return 0;
}