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

int main() {
	int boxWidth, numBlocks;
	std::vector<int> blockWidths;

	std::cin >> boxWidth >> numBlocks;
	for (int i = 0; i < numBlocks; ++i) {
		int r;
		std::cin >> r;
		blockWidths.push_back(r);
	}

	std::sort(blockWidths.begin(), blockWidths.end());

	int sum = 0;
	int count = 0;
	while (sum < boxWidth) {
		sum += blockWidths[count];
		++count;
	}

	std::cout << count;

	return 0;
}