using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

public class Program
{
    public void Solve()
    {
        int S = Reader.Int(), N = Reader.Int();
        var A = Reader.IntArray(N);
        var dp = new int[S + 1];

        for (int i = 1; i <= S; i++)
            dp[i] = -1;
        foreach (int a in A)
            for (int x = 0; x + a <= S; x++)
                if (dp[x] >= 0)
                    CheckMax(ref dp[x + a], dp[x] + 1);
        int ans = S / A.Min();
        var prime = Sieve(S);
        for (int i = 2; i < S; i++)
            if (prime[i] && dp[S - i] > 0)
                ans += dp[S - i];

        Console.WriteLine(ans);
    }

    bool CheckMax(ref int a, int b) { if (b > a) { a = b; return true; } return false; }

    static bool[] Sieve(int n)
    {
        bool[] primes = new bool[n + 1];
        bool[] composite = new bool[n + 1];
        for (int i = 2; i <= n; i++)
        {
            if (composite[i]) continue;
            primes[i] = true;
            for (int j = i + i; j <= n; j += i) composite[j] = true;
        }
        return primes;
    }
}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    static TextReader reader = Console.In;
    static readonly char[] separator = { ' ' };
    static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    static string[] A = new string[0];
    static int i;
    static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Range(N, Int); }
    public static int[][] IntTable(int H) { return Range(H, IntLine); }
    public static string[] StringArray(int N) { return Range(N, Next); }
    public static string[][] StringTable(int N) { return Range(N, () => Split(Line())); }
    public static string Line() { return reader.ReadLine().Trim(); }
    static T[] Range<T>(int N, Func<T> f) { return Enu.Range(0, N).Select(i => f()).ToArray(); }
    static string[] Split(string s) { return s.Split(separator, op); }
    static string Next() { CheckNext(); return A[i++]; }
    static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}