#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  int AW, AB, BW, BB; cin >> AW >> AB >> BW >> BB;
  int C, D; cin >> C >> D;
  int ABB = min(C, AB), ABW = C - ABB;
  AW -= ABW, BW += ABW, BB += ABB;
  int BAW = min(D, BW);
  AW += BAW;
  cout << AW << endl;
}