#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES

#include "bits/stdc++.h"
#define REP(i,a,b) for(i=a;i<b;++i)
#define rep(i,n) REP(i,0,n)
#define ll long long
#define ull unsigned ll
typedef long double ld;
#define ALL(a) (a).begin(),(a).end()
#define ifnot(a) if(not a)
#define dump(x)  cerr << #x << " = " << (x) << endl
using namespace std;

void reader(int &a) { scanf("%d", &a); }
void reader(double &a) { scanf("%lf", &a); }
void reader(char a[]) { scanf("%s", a); }
void reader(char &a) { scanf(" %c", &a); }
void reader(ll &a) { scanf("%lld", &a); }
void reader(ull &a) { scanf("%llu", &a); }
// void reader(string& a){cin >> a;};
template<class T, class U> void reader(T& t, U& u) { reader(t); reader(u); }
template<class T, class U, class V> void reader(T& t, U& u, V& v) { reader(t); reader(u); reader(v); }

void writer(const int a, char c) { printf("%d", a); putchar(c); }
void writer(const ll a, char c) { printf("%lld", a); putchar(c); }
void writer(const ull a, char c) { printf("%llu", a); putchar(c); }
void writer(const double a, char c) { printf("%.20lf", a); putchar(c); }
void writer(const char a[]) { printf("%s", a); };
void writer(const char a[], char c) { printf("%s", a); putchar(c); };
void writer(const char a, char c) { putchar(a); putchar(c); };
template<class T> void writerLn(T t) { writer(t, '\n'); }
template<class T, class U> void writerLn(T t, U u) { writer(t, ' '); writer(u, '\n'); }
template<class T, class U, class V> void writerLn(T t, U u, V v) { writer(t, ' '); writer(u, ' '); writer(v, '\n'); }
template<class T> void writerArr(T x[], int n) { int i; if (!n) { putchar('\n'); return; }rep(i, n - 1) writer(x[i], ' '); writer(x[n - 1], '\n'); }
template<class T> void writerVec(vector<T> x) { int n = x.size(); int i; if (!n) { putchar('\n'); return; }rep(i, n - 1) writer(x[i], ' '); writer(x[n - 1], '\n'); }

vector<string> split(const string &str, char sep) { vector<string> v; stringstream ss(str); string buffer; while (getline(ss, buffer, sep)) { v.push_back(buffer); }return v; }
// #define int ll
bool test = 0;
int dx[] = { 0,1,0,-1 };
int dy[] = { 1,0,-1,0 };
#define INF (1 << 28)
ull mod = (int)1e9 + 7;
//.....................
#define MAX 200005

int M, N;
int c[20];
bool done[10005];
int ans = INT_MIN;
vector<int> order;
vector<int> order_best;
bool isprime(int n) {
	int i;
	if (n < 2) return false;
	for (i = 2; i*i <= n; i++) {
		if (n % i == 0) return false;
	}
	return true;
}
void dfs(int M_now, int cnt) {
	int i;
	rep(i, N) {
		int M_next = M_now - c[i];
		if (M_next >= 0) {
			order.push_back(M_next);
			dfs(M_next, cnt + 1);
			order.pop_back();
			if (isprime(M_next) && (!done[M_next])) {
				order.push_back(M);
				done[M_next] = true;
				dfs(M, cnt + 1);
				done[M_next] = false;
				order.pop_back();
			}
		}
	}
	if (cnt > ans) {
		ans = cnt;
		order_best = order;
	}
}



signed main(void)
{
	int i, j, k, l;
	dump(isprime(100));
	cin >> M >> N;
	rep(i, N) reader(c[i]);
	dfs(M, 0);
	cout << ans << endl;
/*	rep(i, order_best.size()) {
		printf("%d ", order_best[i]);
	}
	puts("")*/;

	return 0;
}