#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <utility>
#include <iomanip>
using namespace std;
#define diff(x, y) ((x) > (y) ? ((x) - (y)) : ((y) - (x)))

int main(void) {
	int l, n, ans = -1;
	cin >> l >> n;
	vector <int> wide(n);
	for (int i = 0; i < n; i++)
		cin >> wide[i];
	sort(wide.begin(), wide.end());
	for (int i = 0; i < n; i++) {
		if (l <= 0)		break;
		l -= wide[i];
		ans++;
	}
	cout << ans << endl;
	return 0;
}