use std::io::*;
use std::str::FromStr;
/*
//use std::num;
//use std::cmp;
//use std::collections::VecDeque;
//use std::io::{self, BufRead};
const LOW_CASE_ALPHABET: [char; 26] = [
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
    't', 'u', 'v', 'w', 'x', 'y', 'z',
];
*/

fn main() {
    let n: usize = read();
    let mut k: isize = read();
    let mut a = vec![0; n];
    let mut tmp = Vec::new();
    let mut ans = 0;

    for _i in 0..a.len() {
        a[_i] = read();
    }

    for _i in 0..a.len() {
        for _j in 0..a.len() - _i - 1 {
            if a[_j] > a[_j + 1] {
                a.swap(_j, _j + 1);
            }
        }
    }

    for _i in 0..n {
        if _i == 0 {
            tmp.push(a[0]);
        } else if _i >= 1 {
            if tmp[tmp.len() - 1] != a[_i] {
                tmp.push(a[_i]);
            }
        }
    }

    let mut tmp_2 = vec![0; tmp.len()];

    for _j in 0..tmp.len(){
        for _i in 0..n{
            if a[_i] == tmp[_j]{
                tmp_2[_j] += 1;
            }
        }  
    }

    for _i in 0..tmp_2.len() {
        for _j in 0..tmp_2.len() - _i - 1 {
            if tmp_2[_j] < tmp_2[_j + 1] {
                tmp_2.swap(_j, _j + 1);
            }
        }
    }

    for _i in 0..tmp.len(){
        k -= tmp_2[_i] as isize;
        ans += 1;
        if k <= 0{
            print!("{}",ans);
            break;
        }
    }
}
/*
let mut temp = String::new();
    std::io::stdin().read_line(&mut temp).ok();
    let temp = temp
        .trim()
        .chars()
        .map(|c| c as usize - '0' as usize)
        .collect::<Vec<_>>();

    let mut iter = temp.iter(); // イテレータを取得

    let a: isize = *iter.next().unwrap() as isize;
    let b: isize = *iter.next().unwrap() as isize;
    let c: isize = *iter.next().unwrap() as isize;

*/
pub fn quicksort(numbers: &mut Vec<u64>) {
    if numbers.len() <= 1 {
        return;
    }

    let pivot = numbers.pop().unwrap();
    let mut lesser = Vec::new();
    let mut greater = Vec::new();

    for num in numbers.iter() {
        if *num <= pivot {
            lesser.push(*num);
        } else {
            greater.push(*num);
        }
    }

    quicksort(&mut lesser);
    quicksort(&mut greater);

    numbers.clear();
    numbers.extend(lesser);
    numbers.push(pivot);
    numbers.extend(greater);
}

pub fn is_leap_year(year: isize) -> bool {
    if ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0) {
        return true;
    } else {
        return false;
    }
}

pub fn ctoi(c: char) -> isize {
    let n = c as isize - '0' as isize;

    return n;
}

pub fn stoi(c: String) -> isize {
    let n = c.parse::<isize>().unwrap();

    return n;
}

pub fn find_char(sentence: Vec<char>, target: char, start: isize) -> isize {
    for _i in start as usize..sentence.len() {
        if sentence[_i] == target {
            return _i as isize;
        }
    }
    return -1;
}

pub fn hex_to_binary(hex_string: &str, x: u32) -> Option<String> {
    match i64::from_str_radix(hex_string, x) {
        Ok(decimal) => Some(format!("{}", decimal)),
        Err(_) => None,
    }
}

pub fn my_floor(x: f64) -> f64 {
    let rounded = (x * 1000.0).floor() / 1000.0;

    rounded
}

pub fn upper_lower(x: char) -> char {
    let result: char;

    if x.is_uppercase() {
        result = x.to_ascii_lowercase();
    } else if x.is_lowercase() {
        result = x.to_ascii_uppercase();
    } else {
        result = x;
    }

    result
}

pub fn maxf_2(x: f64, y: f64) -> f64 {
    let result;

    if x >= y {
        result = x;
    } else {
        result = y;
    }

    result
}

pub fn max_2(x: isize, y: isize) -> isize {
    let result;

    if x >= y {
        result = x;
    } else {
        result = y;
    }

    result
}

pub fn max_u_2(x: usize, y: usize) -> usize {
    let result;

    if x >= y {
        result = x;
    } else {
        result = y;
    }

    result
}

pub fn min_u_2(x: usize, y: usize) -> usize {
    let result;

    if x <= y {
        result = x;
    } else {
        result = y;
    }

    result
}

pub fn min_2(x: isize, y: isize) -> isize {
    let result;

    if x >= y {
        result = y;
    } else {
        result = x;
    }

    result
}

pub fn min_2_i32(x: i32, y: i32) -> i32 {
    let result;

    if x >= y {
        result = y;
    } else {
        result = x;
    }

    result
}

pub fn max_3(x: isize, y: isize, z: isize) -> isize {
    let result;
    if x >= y && y >= z {
        result = x;
    } else if x >= z && z >= y {
        result = x;
    } else if y >= x && x >= z {
        result = y;
    } else if y >= z && z >= x {
        result = y;
    } else if z >= x && x >= y {
        result = z;
    } else {
        result = z;
    }

    result
}

pub fn max_u_3(x: usize, y: usize, z: usize) -> usize {
    let result;
    if x >= y && y >= z {
        result = x;
    } else if x >= z && z >= y {
        result = x;
    } else if y >= x && x >= z {
        result = y;
    } else if y >= z && z >= x {
        result = y;
    } else if z >= x && x >= y {
        result = z;
    } else {
        result = z;
    }

    result
}

pub fn min_3(x: isize, y: isize, z: isize) -> isize {
    let result;
    if x <= y && y <= z {
        result = x;
    } else if x <= z && z <= y {
        result = x;
    } else if y <= x && x <= z {
        result = y;
    } else if y <= z && z <= x {
        result = y;
    } else if z <= x && x <= y {
        result = z;
    } else {
        result = z;
    }

    result
}

pub fn min_u_3(x: usize, y: usize, z: usize) -> usize {
    let result;
    if x <= y && y <= z {
        result = x;
    } else if x <= z && z <= y {
        result = x;
    } else if y <= x && x <= z {
        result = y;
    } else if y <= z && z <= x {
        result = y;
    } else if z <= x && x <= y {
        result = z;
    } else {
        result = z;
    }

    result
}

pub fn read_text() -> String {
    let mut word = String::new();
    std::io::stdin().read_line(&mut word).ok();
    let answer = word.trim().to_string();

    answer
}

pub fn read_array() -> Vec<char> {
    let array: String = read();
    let chars: Vec<char> = array.trim().chars().collect::<Vec<char>>();
    chars
}

pub fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}