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

int main(){
  ll n;
  cin>>n;
  ll a,b,c;
  cin>>a>>b>>c;
  ll ans=0;
  for(ll z=0;z<=n/10;z++){
    for(ll y=0;5*y+10*z<=n;y++){
      for(ll x=0;3*x+5*y+10*z<=n;x++){
        ans=max(ans,a*x+b*y+c*z);
      }
    }
  }
  cout<<ans<<endl;
}