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

using namespace std;

int main()
{
	int L, N;
	cin >> L;
	cin >> N;

	vector<int> W;

	int temp;
	for (int i = 0; i < N; i++){
		cin >> temp;
		W.push_back(temp);
	}

	sort(W.begin(), W.end());

	int sum = 0, count = 0;
	for (vector<int>::size_type i = 0; sum < L; i++){
		sum += W[i];
		count++;
	}
	cout << count-1 << endl;
}