// -*- coding:utf-8-unix -*-
#![allow(non_snake_case)]

#[cfg(debug_assertions)]
#[allow(unused)]
macro_rules! eprintln {
    ($p:tt, $($x:expr),*) => {
        std::eprintln!($p, $($x,)*);
    };
}

#[cfg(not(debug_assertions))]
#[allow(unused)]
macro_rules! eprintln {
    ($p:tt, $($x:expr),*) => {};
}

use proconio::{fastout, input};
// use proconio::marker::Bytes;

#[fastout]
fn main() {
    input!{
        N : usize,
    }
    if 10 <= N && N <= 99{
        println!("Yes")
    }else{
        println!("No")
    }
}