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 c = vec![0; 401];
	for &i in &v[2..] {
		c[400 - i] += 1;
	}
	let mut a = 0;
	for c in c {
		if a + c > v[1] {
			break;
		}
		a += c;
	}
	println!("{a}");
}