#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rrep(i,n) for(int i=(int)(n-1);i>=0;i--)
#define ALL(v) v.begin(),v.end()
#define RALL(v) v.rbegin(),v.rend()
template <class T> using V=vector<T>;
template <class T> using VV=V<V<T>>;
using u128=__int128_t;
using ll=long long;
 
int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  
  ll r,p,q,a,b,c,d;
  cin>>r>>p>>q>>a>>b>>c>>d;
  
  auto f=[&](ll x)->bool{
    ll cost=x*p,e=d,f=0;
    if(a>x) e+=a-x;
    else f+=x-a;
    if(b>x) e+=b-x;
    else f+=x-b;
    if(c>x) e+=c-x;
    else f+=x-c;
    if(f>e) return false;
    cost+=q*f;
    if(cost>r) return false;
    return true;
  };
  
  ll ok=0,ng=2e9;
  while(ng-ok>1){
    ll mid=(ok+ng)/2;
    if(f(mid)) ok=mid;
    else ng=mid;
  }
  cout<<ok<<endl;
    
  return 0;
}