#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let v = read_vec::<usize>();
    let (n, k) = (v[0], v[1]);
    let a = read_vec::<i128>();
    let mut enable = HashSet::new();
    for state in 1i64..1 << n {
        if state.count_ones() < k as u32 {
            continue;
        }
        let mut used = vec![];
        for i in 0..n {
            if (state >> i) & 1 == 1 {
                used.push(a[i]);
            }
        }
        enable.insert(used.iter().sum::<i128>());
        enable.insert(used.iter().product::<i128>());
    }
    println!("{}", enable.len());
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}