#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
  int aw, ab, bw, bb;
  cin >> aw >> ab >> bw >> bb;
  int c, d;
  cin >> c >> d;

  int out = min(c, ab);
  ab -= out;
  bb += out;
  c -= out;
  aw -= c;
  bw += c;

  out = min(bw, d);
  aw += out;
  cout << aw << '\n';
  return 0;
}