#include <bits/stdc++.h>

using i64 = long long;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int H, W, LA, LB;
    i64 KA, KB;
    
    std::cin >> H >> W >> LA >> LB >> KA >> KB;
    
    auto check = [&](int A, int B) {
        i64 r = std::min(1LL * H, 1LL * A * LA);
        i64 c = std::min(1LL * W, 1LL * B * LB);
        return r * c + KA * A + KB * B >= 1LL * H * W;
    };
    
    int ans = H + W;
    
    for (int A = 0, B = H + W; A <= H + W; A++) {
        while (B > 0 && check(A, B - 1)) {
            B--;
        }
        if (check(A, B)) {
            ans = std::min(ans, A + B);
        }
    }
    
    std::cout << ans << "\n";
    
    return 0;
}