func main()
	var n: int :: cui@inputInt()
	var k: int :: cui@inputInt()
	var a: []int :: #[n]int
	for i(0, n - 1)
		do a[i] :: cui@inputInt()
	end for
	do a.sort()
	do a.reverse()
	
	var ans: int :: a[0]
	for i(1, k - 1)
		if(a[i] > 0)
			do ans :+ a[i]
		end if
	end for
	do cui@print("\{ans}\n")
end func