using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[] NMi => ReadLine().Split().Select(c => int.Parse(c) - 1).ToArray();
    static int[][] NMap(int n) => Enumerable.Repeat(0, n).Select(_ => NMi).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var a = NList;
        var ans = 0;
        for (var i = 0; i * 3 <= n; ++i)
        {
            var sub = i * a[0];
            var rest = n - i * 3;
            sub += rest / 10 * Math.Max(a[1] * 2, a[2]);
            if (rest % 10 >= 5) sub += a[1];
            ans = Math.Max(ans, sub);
        }
        WriteLine(ans);
    }
}