pub mod io {
    pub fn scan<R: std::io::BufRead>(r: &mut R) -> Vec<u8> {
        let mut res = Vec::new();
        loop {
            let buf = match r.fill_buf() {
                Ok(buf) => buf,
                Err(e) if e.kind() == std::io::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, $t)).collect::<Vec<_>>());
        ($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, String) => (String::from_utf8(scan!($r, Bytes)).unwrap());
        ($r:expr, Bytes) => (io::scan($r));
        ($r:expr, $t:ty) => (scan!($r, String).parse::<$t>().unwrap());
    }

    #[macro_export]
    macro_rules! input {
        ($r:expr, $($($v:ident)* : $t:tt),* $(,)?) => {
            $(let $($v)* = scan!($r, $t);)*
        };
    }
}

pub fn prime_factorize(mut n: u64) -> Vec<(u64, u64)> {
    let mut res = Vec::new();
    for i in 2.. {
        if i * i > n { break; }
        let mut cnt = 0;
        while n % i == 0 {
            cnt += 1;
            n /= i;
        }
        if cnt > 0 { res.push((i, cnt)); }
    }
    if n > 1 { res.push((n, 1)); }
    res
}

fn run<R: std::io::BufRead, W: std::io::Write>(reader: &mut R, writer: &mut W) {
    input! {
        reader,
        x: u64, a: u64, y: u64, b: u64,
    }

    if y == 1 {
        writeln!(writer, "Yes").ok();
        return;
    }

    let xpf = prime_factorize(x);
    let ypf = prime_factorize(y);
    let mut i = 0;
    for (p2, c2) in ypf {
        while i < xpf.len() && xpf[i].0 < p2 {
            i += 1;
        }
        if i == xpf.len() {
            writeln!(writer, "No").ok();
            return;
        }
        let (p1, c1) = xpf[i];
        if p1 != p2 || c1 * a < c2 * b {
            writeln!(writer, "No").ok();
            return;
        }
        i += 1;
    }
    writeln!(writer, "Yes").ok();
}

fn main() {
    let (stdin, stdout) = (std::io::stdin(), std::io::stdout());
    let ref mut reader = std::io::BufReader::new(stdin.lock());
    let ref mut writer = std::io::BufWriter::new(stdout.lock());
    run(reader, writer);
}