#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int aw, ab, bw, bb;
  cin >> aw >> ab >> bw >> bb;
  int c, d;
  cin >> c >> d;
  int x;
  x = min(ab, c);
  ab -= x;
  aw -= c - x;
  bw += c - x;
  bb += c;
  cout << aw + min(bw, d) << '\n';
  return 0;
}