#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
#include<cmath>
#include<cstdio>
using namespace std;
int main(){
    long long AW,AB,BW,BB,C,D;
    cin >> AW >> AB >> BW >> BB >> C >> D;
    if(AB<C){
            AW -= (C-AB);
            BW += (C-AB);
    }

    if(BW>D)    AW += D;
    else    AW+=BW;
    cout << AW;
    return 0;
}