#include <bits/stdc++.h>
using namespace std;
int main(void){
    long long r,p,q,a,b,c,d;
    cin>>r>>p>>q>>a>>b>>c>>d;
    int mn=0,mx=1e9;
    while(mx-mn){
        int mid=(mx+mn+1)/2;
        int flag=1;
        long long sum=0;
        sum=p*mid+q*(max(mid-a,0LL)+max(mid-b,0LL)+max(mid-c,0LL));
        if(sum>r)flag=0;
        if(mid*3>a+b+c+d)flag=0;
        if(flag){
            mn=mid;
        }else{
            mx=mid-1;
        }
    }
    cout<<mn<<endl;
    return 0;
}