/* -*- coding: utf-8 -*-
 *
 * 5.cc: No.5 数字のブロック - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_L = 10000;
const int MAX_N = 10000;

/* typedef */

/* global variables */

int as[MAX_N + 1], dp[MAX_L + 1];

/* subroutines */

/* main */

int main() {
  int l, n;
  cin >> l >> n;
  
  for (int i = 0; i < n; i++) cin >> as[i];

  memset(dp, -1, sizeof(dp));
  dp[0] = 0;

  for (int i = 0; i < n; i++)
    for (int j = l - as[i]; j >= 0; j--)
      if (dp[j] >= 0 && dp[j + as[i]] < dp[j] + 1)
	dp[j + as[i]] = dp[j] + 1;

  int maxd = 0;
  for (int j = 0; j <= l; j++)
    if (maxd < dp[j]) maxd = dp[j];

  printf("%d\n", maxd);
  return 0;
}