using System;
using System.IO;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using E = System.Linq.Enumerable;

partial class Solver
{
    public class Product
    {
        public int APrice;
        public int BPrice;
    }


    static public bool UpdateMax<T>(ref T x, T newValue) where T : IComparable<T>
    {
        if (x.CompareTo(newValue) < 0) { x = newValue; return true; }
        return false;
    }

    public void Run()
    {
        long N = ni();
        var gA = ni();
        var sA = ni();
        var bA = ni();
        var gB = ni();
        var sB = ni();
        var bB = ni();

        long ans = 0;

        var products = new[]
        {
            new Product{ APrice = gA, BPrice = gB},
            new Product{ APrice = sA, BPrice = sB},
            new Product{ APrice = bA, BPrice = bB},
        };

        var dp = new long[N + 1]; // 使ったどんぐり -> かせげるどんぐり

        {
            for (int i = 0; i <= N; i++)
            {
                long v = 0;
                foreach (var p in products)
                {
                    if (p.APrice < p.BPrice && i >= p.APrice)
                    {
                        UpdateMax(ref v, dp[i - p.APrice] + p.BPrice - p.APrice);
                    }
                }
                dp[i] = v;
            }
        }

        long middleEarning = dp.Max();

        N += middleEarning;

        dp = new long[N + 1];

        {
            for (int i = 0; i <= N; i++)
            {
                long v = 0;
                foreach (var p in products)
                {
                    if (p.BPrice < p.APrice && i >= p.BPrice)
                    {
                        UpdateMax(ref v, dp[i - p.BPrice] + p.APrice - p.BPrice);
                    }
                }
                dp[i] = v;
            }

            N += dp.Max();
        }

        ans = N;

        cout.WriteLine(ans);
    }
}

// PREWRITEN CODE BEGINS FROM HERE
partial class Solver : Scanner
{
    public static void Main(string[] args)
    {
#if LOCAL
        new Solver(Console.In, Console.Out).Run();
#else
        Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        new Solver(Console.In, Console.Out).Run();
        Console.Out.Flush();
#endif
    }

#pragma warning disable IDE0052
    private readonly TextReader cin;
    private readonly TextWriter cout;
#pragma warning restore IDE0052

    public Solver(TextReader reader, TextWriter writer)
        : base(reader)
    {
        this.cin = reader;
        this.cout = writer;
    }
    public Solver(string input, TextWriter writer)
        : this(new StringReader(input), writer)
    {
    }

#pragma warning disable IDE1006
#pragma warning disable IDE0051
    private int ni() { return NextInt(); }
    private int[] ni(int n) { return NextIntArray(n); }
    private long nl() { return NextLong(); }
    private long[] nl(int n) { return NextLongArray(n); }
    private double nd() { return NextDouble(); }
    private double[] nd(int n) { return NextDoubleArray(n); }
    private string ns() { return Next(); }
    private string[] ns(int n) { return NextArray(n); }
#pragma warning restore IDE1006
#pragma warning restore IDE0051
}

public static class LinqPadExtension
{
    static public T Dump<T>(this T obj)
    {
#if LOCAL
        return LINQPad.Extensions.Dump(obj);
#else
        return obj;
#endif
    }
}
public class Scanner
{
    private readonly TextReader Reader;
    private readonly Queue<string> TokenQueue = new Queue<string>();
    private readonly CultureInfo ci = CultureInfo.InvariantCulture;

    public Scanner()
        : this(Console.In)
    {
    }

    public Scanner(TextReader reader)
    {
        this.Reader = reader;
    }

    public int NextInt() { return int.Parse(Next(), ci); }
    public long NextLong() { return long.Parse(Next(), ci); }
    public double NextDouble() { return double.Parse(Next(), ci); }
    public string[] NextArray(int size)
    {
        var array = new string[size];
        for (int i = 0; i < size; i++) array[i] = Next();
        return array;
    }
    public int[] NextIntArray(int size)
    {
        var array = new int[size];
        for (int i = 0; i < size; i++) array[i] = NextInt();
        return array;
    }

    public long[] NextLongArray(int size)
    {
        var array = new long[size];
        for (int i = 0; i < size; i++) array[i] = NextLong();
        return array;
    }

    public double[] NextDoubleArray(int size)
    {
        var array = new double[size];
        for (int i = 0; i < size; i++) array[i] = NextDouble();
        return array;
    }

    public string Next()
    {
        if (TokenQueue.Count == 0)
        {
            if (!StockTokens()) throw new InvalidOperationException();
        }
        return TokenQueue.Dequeue();
    }

    public bool HasNext()
    {
        if (TokenQueue.Count > 0)
            return true;
        return StockTokens();
    }
    static readonly char[] _separator = new[] { ' ' };
    private bool StockTokens()
    {
        while (true)
        {
            var line = Reader.ReadLine();
            if (line == null) return false;
            var tokens = line.Split(_separator, StringSplitOptions.RemoveEmptyEntries);
            if (tokens.Length == 0) continue;
            foreach (var token in tokens)
                TokenQueue.Enqueue(token);
            return true;
        }
    }
}


Measured memory_bytes: 204512