#include <iostream>
using namespace std;
typedef long long ll;

int main()
{
    ll h, w, x, y, a, b;
    cin >> h >> w >> x >> y >> a >> b;
    ll ans = h + w;
    for (ll i = 0; i <= h + w; i++)
    {
        ll ng = -1, ok = h + w;
        while (abs(ok - ng) > 1)
        {
            int j = (ng + ok) / 2;
            if (h * w - min(h, i * x) * min(w, j * y) <= i * a + j * b)
            {
                ok = j;
            }
            else
            {
                ng = j;
            }
        }
        ans = min(ans, i + ok);
    }
    cout << ans << endl;
}