package main

import (
	"fmt"
	"sort"
)

func scan() (L int, N int, W []int) {
	fmt.Scan(&L)
	fmt.Scan(&N)
	for i := 0; i < N; i++ {
		var w int
		fmt.Scan(&w)
		W = append(W, w)
	}
	return L, N, W
}

func main() {
	L, _, W := scan()
	// L, _, W := 16, 3, []int{10, 5, 7}
	// L, _, W := 100, 10, []int{14, 85, 77, 26, 50, 45, 66, 79, 10, 3}
	sort.IntSlice(W).Sort()

	count := 0
	sum := 0

	for _, w := range W {
		sum += w
		if sum >= L {
			break
		}
		count++
	}
	fmt.Print(count)
}