#include <bits/stdc++.h>

using namespace std;

int main() {
    int h, w, la, lb;
    long long ka, kb;
    cin >> h >> w >> la >> lb >> ka >> kb;
    long long mx_h = (la + h - 1) / la;
    long long mx_w = (lb + w - 1) / lb;
    auto check = [&] (long long A, long long B) {
        long long C = (long long) h * w;
        C -= min((long long) la * A, 1LL * h) * min((long long) lb * B, 1LL * w);
        return C <= (long long) ka * A + (long long) kb * B;
    };
    long long ans = mx_h + mx_w;
    for (int i = 0; i <= mx_h; i++) {
        long long ng = 0, ok = mx_w;
        while (ok - ng > 1) {
            long long mid = (ok + ng) >> 1;
            if (check(i, mid)) ok = mid;
            else ng = mid;
        }
        if (check(i, 0)) {
            ans = min(ans, (long long) i);
        }
        if (check(i, ok)) {
            ans = min(ans, i + ok);
        }
    }
    cout << ans << endl;
}