#include <iostream>
#include <iomanip>

typedef long long ll;

int main(void)
{
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);
  std::cout << std::fixed << std::setprecision(13);
  ll aw, ab, bw, bb, c, d;
  std::cin >> aw >> ab >> bw >> bb >> c >> d;
  ll mw, mb;
  mb = std::min(c, ab);
  mw = c - mb;
  aw -= mw; ab -= mb;
  bw += mw; bb += mb;
  mw = std::min(d, bw);
  std::cout << aw + mw << std::endl;
  return 0;
}