use std::io::Read;

fn main() {
	let mut s = String::new();
	std::io::stdin().read_to_string(&mut s).ok();
	let v: Vec<usize> = s.split_whitespace().flat_map(str::parse).collect();
	let mut a = 0;
	for b in (0..=400).rev() {
		let c = v[2..].iter().filter(|&&p| p >= b).count();
		if c > v[1] {
			break;
		}
		a = c;
	}
	println!("{a}");
}