#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
void Say(bool say, string a = "Yes", string b = "No"){cout << (say ? a : b) << endl;};

int main(){
    ll Aw, Ab, Bw, Bb, C, D;
    cin >> Aw >> Ab >> Bw >> Bb >> C >> D;
    for(int i = 0; i < C; i++){
        if(Ab){
            Ab--;
            Bb++;
        }
        else{
            Aw--;
            Bw++;
        }
    }
    for(int i = 0; i < D; i++){
        if(Bw){
            Bw--;
            Aw++;
        }
        else{
            Bb--;
            Ab++;
        }
    }
    cout << Aw << endl;
    return 0;
}