#include <iostream>
#include <cstring>
#include <algorithm>

int l, n;
int w[10001];
int dp[10001];

int main(){
	std::cin >> l >> n;
	for (int i = 0; i < n; i++)std::cin >> w[i];

	memset(dp, -1, sizeof(dp));

	dp[0] = 0;
	for (int i = 0; i < n; i++){
		for (int j = l; j >= 0; j--){
			if (dp[j] == -1)continue;
			if (j + w[i] <= l)dp[j + w[i]] = std::max(dp[j + w[i]], dp[j] + 1);
		}
	}

	std::cout << *std::max_element(dp, dp + l + 1) << std::endl;

	return 0;
}