#include<bits/stdc++.h>
using namespace std;
constexpr int Inf = 1000000010;
constexpr long long INF= 2000000000000000000;

template<typename T> inline bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; }
template<typename T> inline bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; }

template<typename T,typename U>
T modpow(T N, U P, T M = -1) {
    if(P < 0) return 0;
    T ret = 1;
    if(M != -1) ret %= M;
    while(P) {
        if(P & 1) {
            if(M == -1) ret *= N;
            else ret = ret * N % M;
        }
        P /= 2;
        if(M == -1) N *= N;
        else N = N * N % M;
    }
    return ret;
}

constexpr long long MOD = 998244353;

int main() {
    long long h,w,la,lb,ka,kb;
    cin >> h >> w >> la >> lb >> ka >> kb;

    int ng = 0;
    int ok = 2000000;
    while(ok - ng > 1) {
        int mid = (ng + ok) / 2;
        bool isok = false;
        for(int i = 0;i <= mid;i++) {
            long long remain = h * w - min(h,la * i) * min(w,lb * (mid - i));
            if(remain <= i * ka + (mid - i) * kb) isok = true;
        }

        if(isok) ok = mid;
        else ng = mid;
    }

    cout << ok << endl;
}