package main

import . "fmt"
import . "sort"

func main() {
	var x,n int
	Scan(&x,&n)
	w:=make([]int,n)
	for i:=range w {
		Scan(&w[i])
	}
	Ints(w)
	n=0
	for _,v:=range w {
		if v > x {
			break
		}
		x-=v
		n++
	}
	Println(n)
}