import java.util.Scanner
object no5{
    def main(args:Array[String]):Unit={
        val scan = new Scanner(System.in)
        val w = scan.nextInt()
        val n = scan.nextInt()
        val nums = for(i <- 1 to n) yield scan.nextInt()
        val list = nums.sorted
        var count = 0
        var sum = 0
        while(sum <= w){
            sum += list(count)
            count += 1
        }
        println(count-1)
    }
}