fn main() {
    let mut input = String::new();
    std::io::stdin().read_line(&mut input).unwrap();
    let mut input_iter = input.split_whitespace();
    let n: usize = input_iter.next().unwrap().parse().unwrap();
    let k: usize = input_iter.next().unwrap().parse().unwrap();

    let mut a = Vec::new();
    let mut input = String::new();
    std::io::stdin().read_line(&mut input).unwrap();
    let input_iter = input.split_whitespace();
    for num in input_iter {
        let num: usize = num.parse().unwrap();
        a.push(num);
    }

    let mut counts = vec![0; n + 1];
    for i in 0..n {
        counts[a[i]] += 1;
    }
    counts.sort_by(|a, b| b.cmp(a));
    let mut position = 0;
    let mut sum = 0;
    for i in 0..n + 1 {
        sum += counts[position];
        if sum >= k {
            position = i + 1;
            break;
        }
    }

    println!("{}", position);
}