#include <iostream>
using namespace std;

int main()
{
	int box_long;
	int block_num;
	int block_width[10000];
	
	cin >> box_long >> block_num;
	for(int i = 0; i < block_num; ++i)
	{
		cin >> block_width[i];
	}
	
	for(int i = 0; i < block_num - 1; ++i)
	{
		for(int j = block_num - 1; j >= i; --j)
		{
			if(block_width[j - 1] > block_width[j])
			{
				int temp = block_width[j - 1];
				block_width[j - 1] = block_width[j];
				block_width[j] = temp;
			}
		}
	}
	
	int i;
	for(i = 0; (box_long -= block_width[i]) >= 0; ++i);
	
	cout << i << endl;
	
	return 0;
}