#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
using namespace std;

int main() {
	int max_width, num, width;
	vector<int> vt;

	cin >> max_width;
	cin >> num;
	while (num--)
	{
		int temp;
		cin >> temp;
		vt.push_back(temp);
	}
	sort(vt.begin(), vt.end());

	int cnt = 0;
	while ((max_width = (max_width - vt[cnt])) >= 0)
	{
		cnt++;
		if (max_width==0)
		{
			break;
		}
	}

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