package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"sort"
	"strconv"
	"strings"
)

var reader = bufio.NewReaderSize(os.Stdin, 1000000)

func main() {
	boxWidth := newInt()
	boxNumber := newInt()
	line := readLine()

	strs := strings.Split(line, " ")
	ary := make([]int, boxNumber)
	for i := range strs {
		ary[i], _ = strconv.Atoi(strs[i])
	}
	sort.Sort(sort.IntSlice(ary))
	sum := 0
	for i, v := range ary {
		sum += v
		if boxWidth < sum {
			fmt.Println(i)
			break
		}
	}
}

func readLine() string {
	buf := make([]byte, 0, 1000000)
	for {
		l, p, e := reader.ReadLine()
		if e != nil {
			panic(e)
		}
		buf = append(buf, l...)
		if !p {
			break
		}
	}
	return string(buf)
}

func readInt() int {
	line, e := reader.ReadString(' ')
	if e != nil {
		if e == io.EOF {
			i, _ := strconv.ParseInt(line, 10, 0)
			return int(i)
		}
		panic(e)
	}
	line = strings.TrimRight(line, " ")
	i, e := strconv.ParseInt(line, 10, 0)
	if e != nil {
		panic(e)
	}
	return int(i)
}

func newInt() int {
	line, e := reader.ReadString('\n')
	if e != nil {
		panic(e)
	}
	line = strings.TrimRight(line, "\r\n")
	i, e := strconv.ParseInt(line, 10, 0)
	if e != nil {
		panic(e)
	}
	return int(i)
}