#include<vector>
#include<map>
#include<climits>
#include<set>
#include<queue>
#include<algorithm>
#include<functional>
#include<numeric>
#include<utility>
#include<sstream>
#include<iostream>
#include<iomanip>
#include<cstdio>
#include<cmath>
#include<cstdlib>
#include<cctype>
#include<string>
#include<bitset>
#include<cstring>
#include<list>
#include<iterator>
using namespace std;
typedef vector<string>vs;
typedef vector<int>vi;
typedef vector<vi>vvi;
typedef pair<int,int>pii;
typedef long long ll;
typedef pair<ll,ll>pll;
#define rrep(i,x,n) for(int i=(x);i<(n);++i)
#define rep(i,x) rrep(i,0,(x))
#define fi first
#define se second
#define each(i,c) for(typeof((c).begin())i=(c).begin();i!=(c).end();++i)
#define all(c) (c).begin(),(c).end()
#define rall(c) (c).rbegin(),(c).rend()
#define pb push_back


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

    if(Bw>=D){
        Aw+=D;
    }
    else Aw+=Bw;
    cout<<Aw<<endl;
}