#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  ll h, w, la, lb, ka, kb;
  cin >> h >> w >> la >> lb >> ka >> kb;
  ll ans = h + w;
  auto chk = [&](ll ca, ll cb) {
    return min(ca * la, h) * min(cb * lb, w) + ka * ca + kb * cb >= h * w;
  };
  rep(_, 2) {
    for(int i = 0; i <= h; i++) {
      ll r = ans - i;
      if (!chk(i, r)) continue;
      ll l = -1;
      while(r - l > 1) {
        ll c = (r + l) / 2;
        (chk(i, c) ? r : l) = c;
      }
      chmin(ans, i + r);
    }
    swap(h, w);
    swap(la, lb);
    swap(ka, kb);
  }
  cout << ans << '\n';
}