// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------

fn run() {
    input! {
        n: usize,
        s: usize,
    }
    let mut fact = vec![1; s + 1];
    for i in 1..=s {
        fact[i] = fact[i - 1] * i;
    }
    let mut n = n;
    let mut used = vec![false; s];
    let mut p = vec![];
    for i in 0..s {
        let q = n / fact[s - i - 1];
        let mut c = 0;
        for (j, used) in used.iter_mut().enumerate() {
            if !*used {
                if c == q {
                    p.push(j);
                    *used = true;
                }
                c += 1;
            }
        }
        n %= fact[s - i - 1];
    }
    let mut ip = vec![0; s];
    for (i, p) in p.iter().enumerate() {
        ip[*p] = i;
    }
    let mut ans = 0;
    for i in 0..s {
        let f = fact[s - i - 1];
        for j in (i + 1)..s {
            if ip[j] < ip[i] {
                ans += f;
            }
        }
    }
    println!("{}", ans);
}

fn main() {
    run();
}