#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define all(a) begin(a),end(a)
#define sz(a) (int)(a).size()
typedef long long ll;
int main(){
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);
    ll H,W,La,Lb,Ka,Kb;cin>>H>>W>>La>>Lb>>Ka>>Kb;
    ll ans=1e18;
    rep(A,0,H+W+1){
    	ll l=-1,r=H+W+1;
    	while(r-l>1){
      		ll m=(l+r)/2;
      		if(H*W-min(H,La*A)*min(W,Lb*m)<=Ka*A+Kb*m)r=m;
      		else l=m;
    	}
    	if(H*W-min(H,La*A)*min(W,Lb*r)<=Ka*A+Kb*r)ans=min(ans,A+r);
    }
    cout<<ans<<endl;
}