// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------

fn factorize(mut n: u64) -> Vec<(u64, u64)> {
    let mut f = vec![];
    for p in 2.. {
        if p * p > n {
            break;
        }
        let mut c = 0;
        while n % p == 0 {
            n /= p;
            c += 1;
        }
        if c > 0 {
            f.push((p, c));
        }
    }
    if n > 1 {
        f.push((n, 1));
    }
    f
}

fn run() {
    input! {
        x: u64,
        a: u64,
        y: u64,
        b: u64,
    }
    let x = factorize(x).into_iter().map(|p| (p.0, p.1 * a)).collect::<Vec<_>>();
    let y = factorize(y).into_iter().map(|p| (p.0, p.1 * b)).collect::<Vec<_>>();
    let mut ok = true;
    for (p, a) in y {
        ok &= x.iter().any(|x| x.0 == p && x.1 >= a);
    }
    if ok {
        println!("Yes");
    } else {
        println!("No");
    }
}

fn main() {
    run();
}