using System;
using System.Collections.Generic;
using System.Linq;

//No.385 カップ麺生活
class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("100");
            WillReturn.Add("2");
            WillReturn.Add("47 50");
            //5
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("500");
            WillReturn.Add("5");
            WillReturn.Add("111 222 333 444 555");
            //8
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("2447");
            WillReturn.Add("3");
            WillReturn.Add("9 6 10");
            //79842
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        int M = int.Parse(InputList[0]);
        Eratosthenes(M);

        int[] CArr = InputList[2].Split(' ').Select(X => int.Parse(X)).ToArray();
        Array.Sort(CArr); //昇順にソートしておく

        //最大購入数[残金]なDP表
        var DPArr = new Nullable<int>[M + 1];
        DPArr[M] = 0;

        foreach (int EachCost in CArr) {
            for (int I = M; 0 <= I; I--) {
                if (DPArr[I].HasValue == false) continue;

                int NewInd = I - EachCost;
                if (NewInd < 0) break;

                int NewVal = DPArr[I].Value + 1;

                if (DPArr[NewInd].HasValue == false ||
                    DPArr[NewInd].Value < NewVal) {
                    DPArr[NewInd] = NewVal;
                }
            }
        }
        int Answer = 0;

        //残金が素数の購入数を集計
        for (int I = 0; I <= M; I++) {
            if (DPArr[I].HasValue == false) continue;
            if (SosuuArr.Contains(I) == false) continue;
            Answer += DPArr[I].Value;
        }

        //最大の購入数を加算
        Answer += DPArr.Max(X => X ?? 0);

        Console.WriteLine(Answer);
    }

    static int[] SosuuArr;

    //エラトステネスの篩
    static void Eratosthenes(int pJyougen)
    {
        var CheckArr = new System.Collections.BitArray(pJyougen + 1);
        for (int I = 2; I <= CheckArr.Count - 1; I++) {
            CheckArr[I] = true;
        }
        for (int I = 2; I <= CheckArr.Count - 1; I++) {
            if (I != 2 && I % 2 == 0) continue;

            if (CheckArr[I]) {
                for (int J = I * 2; J <= CheckArr.Count - 1; J += I) {
                    CheckArr[J] = false;
                }
            }
        }
        var SosuuList = new List<int>();
        for (int I = 2; I <= CheckArr.Count - 1; I++)
            if (CheckArr[I]) SosuuList.Add(I);

        SosuuArr = SosuuList.ToArray();
    }
}