#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
int main()
{
	vector<int> arr;
	int a, b, c=0;
	cin >> a >> b;
	arr.resize(b);
	while (b>0)
	{
		cin >> arr[b-1];
		b--;
	}

	sort(arr.begin(), arr.end());
	for (unsigned int i = 0; i < arr.size(); i++)
	{
		a -= arr[i];
		if (a < 0) break;
		c++;
	}

	cout << c << endl;

	return 0;
}