#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
using namespace std;
#ifdef LOCAL_DEV
	void debug_impl() { std::cerr << std::endl; }
	template<typename Head, typename... Tail> void debug_impl(Head head, Tail... tail) { std::cerr << " " << head << (sizeof...(tail) ? "," : ""); debug_impl(tail...); }
	#define debug(...) std::cerr << std::boolalpha << "(" << #__VA_ARGS__ << ") ="; debug_impl(__VA_ARGS__); std::cerr << std::noboolalpha;
#else
	#define debug(...)
#endif
#ifdef LOCAL_TEST
	#define BOOST_STACKTRACE_USE_ADDR2LINE
	#define BOOST_STACKTRACE_ADDR2LINE_LOCATION /usr/local/opt/binutils/bin/addr2line
	#define _GNU_SOURCE
	#include <boost/stacktrace.hpp>
	template<typename T> class dvector : public std::vector<T> {
	public:
		dvector() : std::vector<T>() {}
		explicit dvector(size_t n, const T& value = T()) : std::vector<T>(n, value) {}
		dvector(const std::vector<T>& v) : std::vector<T>(v) {}
		dvector(const std::initializer_list<T> il) : std::vector<T>(il) {}
		dvector(const typename std::vector<T>::iterator first, const typename std::vector<T>::iterator last) : std::vector<T>(first, last) {}
		dvector(const std::string::iterator first, const std::string::iterator last) : std::vector<T>(first, last) {}
		T& operator[](size_t n) {
			try { return this->at(n); } catch (const std::exception& e) {
				std::cerr << boost::stacktrace::stacktrace() << std::endl; return this->at(n);
			}
		}
		const T& operator[](size_t n) const {
			try { return this->at(n); } catch (const std::exception& e) {
				std::cerr << boost::stacktrace::stacktrace() << std::endl; return this->at(n);
			}
		}
	};
	class dbool {
	private:
		bool boolvalue;
	public:
		dbool() : boolvalue(false) {}
		dbool(bool b) : boolvalue(b) {}
		dbool(const dbool &b) : boolvalue(b.boolvalue) {}
		operator bool&() { return boolvalue; }
		operator const bool&() const { return boolvalue; }
	};
	template<typename T1, typename T2> std::ostream& operator<<(std::ostream& s, const std::pair<T1, T2>& p) { return s << "(" << p.first << ", " << p.second << ")"; }
	template<typename T> std::ostream& operator<<(std::ostream& s, const dvector<T>& v) {
		for (int i = 0, len = v.size(); i < len; ++i){ s << v[i]; if (i < len - 1) s << "\t"; } return s; }
	template<typename T> std::ostream& operator<<(std::ostream& s, const dvector< dvector<T> >& vv) {
		for (int i = 0, len = vv.size(); i < len; ++i){ s << vv[i] << std::endl; } return s; }
	template<typename T1, typename T2> std::ostream& operator<<(std::ostream& s, const std::map<T1, T2>& m) {
		s << "{" << std::endl; for (auto itr = m.begin(); itr != m.end(); ++itr){ s << "\t" << (*itr).first << " : " << (*itr).second << std::endl; } s << "}" << std::endl; return s; }
	template<typename T> std::ostream& operator<<(std::ostream& s, const std::set<T>& se) {
		s << "{ "; for (auto itr = se.begin(); itr != se.end(); ++itr){ s << (*itr) << "\t"; } s << "}" << std::endl; return s; }
	template<typename T> std::ostream& operator<<(std::ostream& s, const std::multiset<T>& se) {
		s << "{ "; for (auto itr = se.begin(); itr != se.end(); ++itr){ s << (*itr) << "\t"; } s << "}" << std::endl; return s; }
	#define vector dvector
	#define bool dbool
#endif
//#define int long long
using ll = long long;
using bll = boost::multiprecision::cpp_int;
using bdouble = boost::multiprecision::cpp_dec_float_100;
//constexpr int INF = 1e9;//INT_MAX=(1<<31)-1=2147483647
constexpr ll INF = (ll)1e18;//(1LL<<63)-1=9223372036854775807
constexpr ll MOD = (ll)1e9 + 7;
constexpr double EPS = 1e-9;
constexpr int dx[4]={1,0,-1,0};
constexpr int dy[4]={0,1,0,-1};
#define p(var) std::cout<<var<<std::endl
#define PI (acos(-1))
#define rep(i, n)   for(ll i=0, i##_length=(n); i< i##_length; ++i)
#define repeq(i, n) for(ll i=1, i##_length=(n); i<=i##_length; ++i)
#define all(v) (v).begin(), (v).end()
#define uniq(v) (v).erase(unique((v).begin(), (v).end()), (v).end());
template<typename T> inline void pv(vector<T> &v) { for(ll i=0, N=v.size(); i<N; i++) std::cout << v[i] << " \n"[i==N-1]; }
template<typename T> inline T gcd(T a, T b) { return b ? gcd(b,a%b) : a; }
template<typename T> inline T lcm(T a, T b) { return a / gcd(a,  b) * b; }
template<typename T1, typename T2> inline T1 power(T1 x, T2 n){ return n ? power(x*x%MOD,n/2)*(n%2?x:1)%MOD : 1; }
template<typename T1, typename T2> inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }
template<typename T1, typename T2> inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

/*-----8<-----8<-----*/

class Item{
public:
	ll value, weight, index;
	Item() {}
	Item(ll value, ll weight, ll index) : value(value), weight(weight), index(index) {}
};
ostream& operator<<(ostream& s, const Item& item) {
	s << "{ " << item.index << " : value = " << item.value << ", weight = " << item.weight << " }";
	return s;
}

class KnapsackBB{
public:
	//商品一覧
	vector<Item> items;
	//各商品の在庫数
	vector<ll> item_size;
	//商品の種類数
	ll N;
	//ナップサックの容量
	ll W;
	//現在探索している商品の選び方　used_items[i]=j -> i番目の商品をj個選択
	vector<ll> used_items;
	//現時点で最適な商品の選び方　opt_items[i]=j -> i番目の商品をj個選択
	vector<ll> opt_items;
	//現時点で最適な商品の選び方をしたときの価値合計
	ll opt_value=0;

	KnapsackBB(vector<Item> &items, vector<ll> &item_size, ll W) : items(items), item_size(item_size), N(items.size()), W(W) {}

	//分枝限定法で探索
	//index=index-1番目の商品までは選択が終わった、index番目からの商品はまだ調べてない
	//value=今のところの価値合計
	//weight=今のところの重さ合計
	void searchbb(ll index, ll value, ll weight){
		//全部調べ終わった
		if(index==N || items[index].value<=0){
			if(opt_value < value){
				opt_items=used_items;
				opt_value=value;
			}
			return;
		}

		//緩和問題を解く
		ll tmp_weight=weight;
		double tmp_value=value;
		for(ll i=index; i<N; i++){
			ll size=(W-tmp_weight)/items[i].weight;
			if(item_size[i]>=size){
				if((W-tmp_weight)%items[i].weight==0){
					//緩和問題の解が元の問題でも実現可能→暫定解として使えるかも
					tmp_value+=items[i].value*size;
					if(opt_value<tmp_value){
						opt_value=tmp_value;
						opt_items=used_items;
						for(ll j=index; j<i; j++){
							opt_items[j]=item_size[j];
						}
						opt_items[i]=size;
					}
					return;
				}
				//重さの余りを詰める
				double sizedouble=(double)(W-tmp_weight)/items[i].weight;
				tmp_value+=items[i].value*sizedouble;
				tmp_weight=W;
				break;
			}else{
				tmp_value+=items[i].value*item_size[i];
				tmp_weight+=items[i].weight*item_size[i];
			}
		}

		//緩和問題ですら暫定解を超えられない→これ以上調査する意味がない
		if(tmp_value < opt_value){
			return;
		}

		//重量制限が許されれば、index番目をi個選ぶ場合で探索
		for(ll i=(W-weight)/items[index].weight; i>=0; i--){
			used_items[index]=i;
			searchbb(index+1, value+(items[index].value*i), weight+(items[index].weight*i));
		}
	}

	ll search(){
		//商品をコスパのよい順に並び替え
		sort(items.begin(), items.end(), [](const Item &x, const Item &y) {
			return ((double)x.value/x.weight) > ((double)y.value/y.weight);
		});

		//暫定解として貪欲に選んでみる
		ll opt_weight=0;
		opt_value=0;
		opt_items.assign(N,0);
		for(ll i=0; i<N; i++){
			if(items[i].value<=0)break;
			ll size=(W-opt_weight)/items[i].weight;
			if(item_size[i]>=size){
				opt_weight+=items[i].weight*size;
				opt_value+=items[i].value*size;
				opt_items[i]=size;
			}else{
				opt_weight+=items[i].weight*item_size[i];
				opt_value+=items[i].value*item_size[i];
				opt_items[i]=item_size[i];
			}
		}
		used_items.assign(N,0);

		searchbb(0,0,0);
		return opt_value;
	}
};

signed main(){
	//diverta 2019 Programming Contest 2-D
	//https://atcoder.jp/contests/diverta2019-2/tasks/diverta2019_2_d

	ll W;
	ll gA, sA, bA;
	ll gB, sB, bB;
	scanf("%lld", &W);
	scanf("%lld%lld%lld", &gA, &sA, &bA);
	scanf("%lld%lld%lld", &gB, &sB, &bB);

	vector<Item> items;
	items.push_back(Item(gB-gA, gA, 0));
	items.push_back(Item(sB-sA, sA, 1));
	items.push_back(Item(bB-bA, bA, 2));
	vector<ll> item_size(items.size(), INF);
	KnapsackBB knapsack(items, item_size, W);
	ll opt_value = knapsack.search();

	W+=opt_value;

	vector<Item> items2;
	items2.push_back(Item(gA-gB, gB, 0));
	items2.push_back(Item(sA-sB, sB, 1));
	items2.push_back(Item(bA-bB, bB, 2));
	vector<ll> item_size2(items2.size(), INF);
	KnapsackBB knapsack2(items2, item_size2, W);
	opt_value = knapsack2.search();

	printf("%lld\n", W+opt_value);

	return 0;
}


Measured memory_bytes: 256