import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class No5 {
	
	/**
	 * @param args
	 * @throws IOException 
	 * @throws NumberFormatException 
	 */
	public static void main(String[] args) throws NumberFormatException, IOException {
		
		int boxLength;
		
		// inputの準備
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		boxLength = Integer.parseInt(br.readLine());
		br.readLine();
		String[] blockLengthStringList = br.readLine().split(" ");
		int[] blockLengthList = new int[blockLengthStringList.length];
		for(int i=0; i < blockLengthStringList.length; i++) {
			blockLengthList[i] = Integer.parseInt(blockLengthStringList[i]);
		}
		Arrays.sort(blockLengthList);
		
		// ボックスに最大何個入れられるかを計算
		int insertNum = -1;
		int sumLength = 0;
		for(int i = 0; sumLength < boxLength; i++) {
			sumLength += blockLengthList[i];
			insertNum++;
		}
		System.out.println(insertNum);
	}
}