#include<iostream>
#include<vector>
using namespace std;
using ll=long long;
#define rep(i,n) for(int i=0;i<n;i++)
#define rrep(i,n) for(int i=(n)-1;i>=0;i--)
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
template<class T> bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;}
template<class T> bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll h,w,la,lb,ka,kb;
    cin>>h>>w>>la>>lb>>ka>>kb;
    ll ans=1LL<<60;
    if(ka!=0)chmin(ans,(h*w+ka-1)/ka);
    if(kb!=0)chmin(ans,(h*w+kb-1)/kb);
    rep(i,(h+la-1)/la+1){
        ll x=min(h,i*la);
        ll ng=-1,ok=(w+lb-1)/lb+1;
        while(ok-ng>1){
            ll mid=(ok+ng)/2;
            ll y=min(w,mid*lb);
            ll d=h*w-x*y;
            if(i*ka+mid*kb>=d)ok=mid;
            else ng=mid;
        }
        if(ok==(w+lb-1)/lb+1)continue;
        chmin(ans,i+ok);
    }
    rep(i,(w+lb-1)/lb+1){
        ll y=min(w,i*lb);
        ll ng=-1,ok=(h+la-1)/la+1;
        while(ok-ng>1){
            ll mid=(ok+ng)/2;
            ll x=min(h,mid*la);
            ll d=h*w-x*y;
            if(i*kb+mid*ka>=d)ok=mid;
            else ng=mid;
        }
        if(ok==(h+la-1)/la+1)continue;
        chmin(ans,i+ok);
    }
    cout<<ans<<"\n";
}