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*/

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

using VI = vector<int>;
using VVI = vector<VI>;
using PII = pair<int, int>;
using LL = long long;
using VL = vector<LL>;
using VVL = vector<VL>;
using PLL = pair<LL, LL>;
using VS = vector<string>;

#define ALL(a)  begin((a)),end((a))
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define MT make_tuple
#define SZ(a) int((a).size())
#define SORT(c) sort(ALL((c)))
#define RSORT(c) sort(RALL((c)))
#define UNIQ(c) (c).erase(unique(ALL((c))), end((c)))

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

#define FF first
#define SS second

template<class S, class T>
istream& operator>>(istream& is, pair<S,T>& p){
  return is >> p.FF >> p.SS;
}
template<class T>
istream& operator>>(istream& is, vector<T>& xs){
  for(auto& x: xs)
	is >> x;
  return is;
}
template<class S, class T>
ostream& operator<<(ostream& os, const pair<S,T>& p){
  return os << p.FF << " " << p.SS;
}
template<class T>
ostream& operator<<(ostream& os, const vector<T>& xs){
  for(unsigned int i=0;i<xs.size();++i)
	os << (i?" ":"") << xs[i];
  return os;
}
template<class T>
void maxi(T& x, T y){
  if(x < y) x = y;
}
template<class T>
void mini(T& x, T y){
  if(x > y) x = y;
}
void debug(istringstream&){}
template <char sep=',', class Head, class... Tail>
void debug(istringstream& iss, Head&& head, Tail&&... tail)
{
  string name;
  getline(iss, name, ',');
  cout << sep << name << "=" << head;
  debug(iss, forward<Tail>(tail)...);
}

#ifdef PYONPOI
#define DEBUG(...) \
  do{ \
    istringstream ss(#__VA_ARGS__); \
    debug<' '>(ss, __VA_ARGS__); \
    cout<<endl; \
  }while(0)
#else
#define DEBUG
#endif


const double EPS = 1e-10;
const double PI  = acos(-1.0);
const LL MOD = 1e9+7;

LL solve(LL W, vector<PLL> xs){
  LL ans = W;
  sort(ALL(xs), [](PLL p, PLL q){return p.SS * 1. / p.FF > q.SS * 1. / q.FF;});
  for(LL w=0;w<=W;w+=xs[0].FF){
    LL ww = W - w;
    LL w1u = ww / xs[1].FF;

    for(LL dw=0;dw<=min(1ll,w1u);++dw){
      LL w1 = w1u - dw;
      LL w2 = (ww - w1 * xs[1].FF) / xs[2].FF;
      maxi(ans, W + w / xs[0].FF * xs[0].SS + w1 * xs[1].SS + w2 * xs[2].SS);
    }
    maxi(ans, W + w / xs[0].FF * xs[0].SS + w1u * xs[1].SS);
    maxi(ans, W + w / xs[0].FF * xs[0].SS);
  }

  return ans;
}

int main(){
  cin.tie(0);
  ios_base::sync_with_stdio(false);

  LL N;
  cin >> N;

  VL xs(6);
  cin >> xs;

  vector<PLL> w1, w2;
  REP(i,3){
    w1.PB(MP(xs[i], xs[i+3] - xs[i]));
    w2.PB(MP(xs[i+3], xs[i] - xs[i+3]));
  }

  LL x = solve(N, w1);
  x = solve(x, w2);

  cout << x << endl;

  return 0;
}

Measured memory_bytes: 256