#include <iostream>

using namespace std;

int main() {
	int l, n;
	cin >> l;
	cin >> n;
	int box[n];
	int sum = 0;
	int count = 0;
	for(int i = 0; i < n; i++) {
		cin >> box[i];
	}
	while (sum <  l) {
		int min = 10000;
		int j;
		for(int i = 0; i < n; i++) {
			if (box[i] != -1 && box[i] < min) {
				min = box[i];
				j = i;
			}
		}
		sum += min;
		count++;		
		box[j] = -1;
	}
	cout << count - 1 ;
}