package main

import (
	"fmt"
	"sort"
)

func resolve(L, N int, W []int) int {
	sort.Sort(sort.IntSlice(W))
	tmp := 0
	for i := 0; i < N; i++ {
		tmp += W[i]
		if tmp >= L {
			return i
		}
	}
	return N
}

func main() {
	var L int
	var N int
	var W []int

	fmt.Scanf("%d\n", &L)
	fmt.Scanf("%d\n", &N)
	for i := 0; i < N; i++ {
		var w int
		fmt.Scanf("%d", &w)
		W = append(W, w)
	}
	fmt.Scanf("\n")

	fmt.Println(resolve(L, N, W))
}