#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#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(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  ll ans = 0;
  ll n;
  cin >> n;
  int a[3];
  ll b[3];
  rep(i, 3) cin >> a[i] >> b[i];
  rep(_, 3) {
    rep(i, 2001) rep(j, 2001) {
      ll rest = n - (a[0] * i + a[1] * j);
      if (rest < 0) break;
      ll k = rest / a[2];
      chmax(ans, b[0] * i + b[1] * j + b[2] * k);
    }
    rotate(a, a + 1, a + 3);
    rotate(b, b + 1, b + 3);
  }
  cout << ans << '\n';
}