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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll n;
    cin >> n;
    vector<pair<ll, ll>> a(3);
    for(int i = 0; i < 3; i++){
        cin >> a[i].first >> a[i].second;
    }
    sort(a.begin(), a.end(), [&](pair<ll, ll> lhs, pair<ll, ll> rhs){
        return lhs.second * rhs.first < lhs.first * rhs.second;
    });
    int lcmv = 2000000;
    vector<ll> dp(lcmv + 1);
    for(int i = 0; i < 3; i++){
        ll v1, v2;
        tie(v1, v2) = a[i];
        for(int j = 0; j + v1 <= lcmv; j++){
            dp[j + v1] = max(dp[j + v1], dp[j] + v2);
        }
    }
    ll ans = 0;
    for(int j = 0; j <= lcmv && j <= n; j++){
        for(int k = 0; k < 3; k++){
            ans = max(ans, dp[j] + ((n - j) / a[k].first) * a[k].second);
        }
    }
    cout << ans << '\n';
}