#![allow(non_snake_case, unused_imports)]

use proconio::{input, marker::Usize1, marker::Chars};
use itertools::Itertools;

#[allow(unused_macros)]
macro_rules! d {
    ( $( $x:expr ),* $(,)? ) => {
        eprintln!(
            concat!( $( stringify!($x), "={:?} " ),* ),
            $( $x ),*
        );
    };
}

#[allow(dead_code)]
fn yn(b: bool) -> &'static str {
    if b { "Yes" } else { "No" }
}

fn main() {
    input! {
        N: i64,
    }

    let xs = N.to_string()
        .chars()
        .map(|c| c.to_digit(10).unwrap())
        .collect_vec();

    let [a, b, c] = xs.try_into().unwrap();
    println!("{}", yn(a + c == b));
}