package main

import (
	"fmt"
	"sort"
)

func main() {
	var L, N int
	fmt.Scan(&L, &N)
	box := make([]int, N)
	for i := range box {
		fmt.Scan(&box[i])
	}
	sort.Ints(box)
	var ans int
	for _, v := range box {
		if L-v > 0 {
			L -= v
			ans++
		} else {
			break
		}
	}
	fmt.Println(ans)
}