package main

import (
    "fmt"
    "sort"
)

func main() {
    // Your code here!
    var total int
    fmt.Scan(&total)
    
    var num int
    fmt.Scan(&num)
    
    t := make([]int, num)
    for i := 0; i < num; i++ {
        fmt.Scan(&t[i])
    }
    sort.Ints(t)
    
    for k, v := range t {
        total -= v
        if total == 0 {
            fmt.Println(k+1)
            break
        } else if total < 0 {
            fmt.Println(k)
            break
        }
    }
}