#![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::(); let (n, k) = (v[0], v[1]); let mut visited = vec![false; n + 1]; let mut q = VecDeque::new(); q.push_back((n, 0)); while let Some((num, i)) = q.pop_front() { if i > k { println!("NO"); return; } if num == 1 { println!("YES"); return; } if visited[num] { continue; } visited[num] = true; if num >= 3 && !visited[num - 3] { q.push_back((num - 3, i + 1)); } if num % 2 == 0 && !visited[num / 2] { q.push_back((num / 2, i + 1)); } } // debug!(visited); println!("NO"); } fn read() -> T { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); s.trim().parse().ok().unwrap() } fn read_vec() -> Vec { read::() .split_whitespace() .map(|e| e.parse().ok().unwrap()) .collect() }