#include"bits/stdc++.h"

//#include<bits/stdc++.h>
using namespace std;
#define print(x) cout<<x<<endl;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a) for(int i=0;i<a;i++)
typedef long long ll;
typedef pair<int, int> PI;
typedef pair<int, PI> V;
const ll mod = 100000000;

int c, n, a[102];
int dp[102][100002] = {};

int dfs(int i, int j) {
	if (i == n)return mod;
	if (j == 0)return 0;
	if (dp[i][j] < mod)return dp[i][j];
	for (int l = 0; j - l*a[i] >= 0; l++) {
		dp[i][j] = min(dp[i][j], l+dfs(i + 1, j - l*a[i]));
	}
	return dp[i][j];
}

int main() {
	REP(i, 102)REP(j, 100002)dp[i][j] = mod;
	cin >> c; cin >> n;
	REP(i, n)cin >> a[i];
	print(dfs(0, c));
	return 0;
}