#include <bits/stdc++.h>
#include <atcoder/all>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=b-1;i>=a;i--)
#define all(x) (x).begin(),(x).end()
#define pb(x) push_back(x);
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
typedef long long ll;
typedef long double lld;
using namespace std;
using namespace atcoder;
using mint = static_modint<998244353>;
// using mint = static_modint<1000000007>;
const ll mod=998244353;
//const ll mod=1e9+7;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
const string zton="0123456789";
const string atoz="abcdefghijklmnopqrstuvwxyz";
const string ATOZ="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const ll inf=(1ll<<60);
// const int inf=(1<<30);
lld dist(lld x1,lld x2,lld y1,lld y2){
    lld res=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
    res=sqrt(abs(res));
    return res;
}
lld arg(lld x,lld y){
    const lld eps=1e-8;
    lld res=0;
    if(abs(x)+abs(y)<=eps)return 0.0;
    else if(abs(x)<=eps){
        if(y>=0.0)return (M_PI/2);
        else return (M_PI/2+M_PI);
    }
    else if(abs(y)<=eps){
        if(x>=0.0)return 0.0;
        else return M_PI;
    }
    res=atan2(abs(y),abs(x));
    if(x<=0&&y>=0)res=(M_PI-res);
    else if(x<=0&&y<=0)res+=(M_PI);
    else if(x>=0&&y<=0)res=(M_PI*2-res);
    return res;
}
ll gcd(ll a,ll b){
    if(a==0||b==0)return a+b;
    ll r;
    r=a%b;
    if(r==0){
        return b;
    }
    else{
        return gcd(b,r);
    }
}
typedef pair<ll,int> P;

int H,W,La,Lb;
ll Ka,Kb;

bool check(int a,int mid){
    ll h1=a;
    h1*=La;
    chmin(h1,H*1ll);
    ll h2=H-h1;
    ll w1=mid;
    w1*=Lb;
    chmin(w1,W*1ll);
    ll w2=W-w1;
    ll ex=Ka*a+Kb*mid;
    ll T=h2*w1;
    ll U=h1*w2;
    ll V=h2*w2;
    if(T+U+V<=ex)return true;
    return false;
}

int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> H >> W >> La >> Lb >> Ka >> Kb;
    int ans=(H+La-1)/La+(W+Lb-1)/Lb;
    rep(a,0,(H+La-1/La)+1){
        int ok=ans-a;
        if(ok<0)continue;
        if(check(a,ok)==false)continue;
        int ng=-1;
        while(ng+1!=ok){
            int mid=(ok+ng)/2;
            if(check(a,mid))ok=mid;
            else ng=mid;
        }
        chmin(ans,a+ok);
    }
    swap(H,W);
    swap(La,Lb);
    swap(Ka,Kb);
    rep(a,0,(H+La-1/La)+1){
        int ok=ans-a;
        if(ok<0)continue;
        if(check(a,ok)==false)continue;
        int ng=-1;
        while(ng+1!=ok){
            int mid=(ok+ng)/2;
            if(check(a,mid))ok=mid;
            else ng=mid;
        }
        chmin(ans,a+ok);
    }
    cout << ans << endl;
}