#include<bits/stdc++.h>

using namespace std;

int main(){
    int n,a,b,c;
    cin >> n >> a >> b >> c;
    int ans = 0;
    for(int j = 0;j * 10 <= n;j++){
        for(int i = 0;j * 10 + i * 5 <= n;i++){
            ans = max(ans,j * c + i * b + (n - j * 10 - i * 5) / 3 * a);
        }
    }
    cout << ans << endl;
    return 0;
}