pub mod io { use std::io::{BufRead, ErrorKind}; pub fn scan(r: &mut R) -> Vec { let mut res = Vec::new(); loop { let buf = match r.fill_buf() { Ok(buf) => buf, Err(e) if e.kind() == ErrorKind::Interrupted => continue, Err(e) => panic!("{}", e), }; let (done, used, buf) = { match buf.iter().position(u8::is_ascii_whitespace) { Some(i) => (i > 0 || res.len() > 0, i + 1, &buf[..i]), None => (buf.is_empty(), buf.len(), buf), } }; res.extend_from_slice(buf); r.consume(used); if done { return res; } } } #[macro_export] macro_rules! scan { ($r:expr, [$t:tt; $n:expr]) => { (0..$n).map(|_| scan!($r, $t)).collect::>() }; ($r:expr, [$t:tt]) => { scan!($r, [$t; scan!($r, usize)]) }; ($r:expr, ($($t:tt),*)) => { ($(scan!($r, $t)),*) }; ($r:expr, Usize1) => { scan!($r, usize) - 1 }; ($r:expr, Bytes) => { io::scan($r) }; ($r:expr, String) => { String::from_utf8(scan!($r, Bytes)).unwrap() }; ($r:expr, $t:ty) => { scan!($r, String).parse::<$t>().unwrap() }; } #[macro_export] macro_rules! input { ($($($v:ident)* : $t:tt),* $(,)?) => { let stdin = std::io::stdin(); let ref mut reader = std::io::BufReader::new(stdin.lock()); $(let $($v)* = scan!(reader, $t);)* }; } } // Reference: sansen's code pub mod next_permutation { pub trait NextPermutation { fn next_permutation(&mut self) -> bool; } impl NextPermutation for [T] { fn next_permutation(&mut self) -> bool { self.windows(2).rposition(|a| a[0] < a[1]).map_or(false, |i| { let j = self.iter().rposition(|x| self[i] < *x).unwrap(); self.swap(i, j); self[(i + 1)..].reverse(); true }) } } } use next_permutation::NextPermutation; fn main() { input! { k: u32, } let mut ans = 0; let mut s = "12345678".chars().collect::>(); while { let n = s.iter().collect::().parse::().unwrap(); if n % k == 0 { ans += 1; } s.next_permutation() } {} println!("{}", ans); }