package main

import . "fmt"

func main() {
	var n,k int
	Scan(&n,&k)
	p:=make([]int,n)
	for i:=range p{
		Scan(&p[i])
	}
	var a int
	for b:=0;b<=401;b++ {
		var c int
		for _,s:=range p {
			if s>=b {
				c++
			}
		}
		if c>a&&c<=k {
			a=c
		}
	}
	Println(a)
}