// Problem: No.2386 Udon Coupon (Easy)No.2386 乌冬面优惠券 （简易）
// Contest: yukicoder
// URL: https://yukicoder.me/problems/no/2386
// Memory Limit: 512 MB
// Time Limit: 2000 ms
// 
// Powered by CP Editor (https://cpeditor.org)

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=2e5+10;
const int INF=0x3f3f3f3f;
const int mod=1e9+7;
#define x first
#define y second
ll ksm(ll n,ll p,int mod){
	int ans=1;
	while(p){
		if(p&1) ans=(ans*n)%mod;
		n=(n*n)%mod;p>>=1;
	}
	return ans;
}
ll inv(ll b,ll c=mod) {return ksm(b,c-2,c);}
class Num{
public:
	ll num;
	Num(ll x) {num=(x%mod+mod)%mod;}
	Num operator+(Num p) {return Num(num+p.num);}
	Num operator-(Num p) {return Num(num-p.num);}
	Num operator*(Num p) {return Num(num*p.num);}
	Num operator/(Num p) {return Num(num*inv(p.num));}
	Num operator=(Num p) {this->num=p.num;return *this;}
	friend ll get(Num p) {return p.num;}
};
void solve() {
	ll n;
	cin>>n;
	vector<pair<ll,ll>> ve;
	for(int i=0;i<3;i++) {
		ll a,b;
		cin>>a>>b;
		ve.push_back({a,b});
	}
	sort(ve.begin(),ve.end(),[](auto p1,auto p2){
		return p1.y*p2.x>=p1.x*p2.y;
	});
	ll ans=0;
	for(int i=1;i<3;i++) {
		ans+=n/ve[i-1].x*ve[i-1].y;
		n%=ve[i-1].x;
		
		ans+=n/ve[i].x*ve[i].y;
		n%=ve[i].x;
	}
	cout<<ans<<endl;
}
int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int T=1;
    //cin>>T;
    while(T--) {
    	solve();
    }
    return 0;
}