#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <tuple>
#include <bitset>

#define rep(i,n) for(i=0; i<n; ++i)
#define in(a) cin >> a
#define out(a,b) cout << a << b
using namespace std;
using lint = long long;

bool is_prime(lint n){
    if(n==2||n==3)    return true;
    if(n<2||n%2==0) return false;
    bool f=true;
    for(lint i=3; i*i<=n; i+=2){
        if(n%i==0){
            f=false; break;
        }
    }
    return f;
}

vector<pair<lint, lint>> prime_factorize(int n){
    vector<pair<lint, lint>> prime_factors; lint p=2, cnt=0;
    while(n>1){
        if(n%p!=0){
            if(cnt!=0){
                prime_factors.push_back(make_pair(p, cnt)); cnt=0;
            }
            do{p++;}while(!is_prime(p));
        }
        else{
            n/=p; cnt++;
        }
    }
    prime_factors.push_back(make_pair(p, cnt));
    return prime_factors;
}

lint div_much(int r_sml, int n_lrg){
    lint cnt=0;
    while(n_lrg%r_sml==0){
        n_lrg/=r_sml;
        cnt++;
    }
    return cnt;
}

int main(void){
    lint i, j;
    lint p, n, m;
    lint x, a, y, b;
    in(x); in(a); in(y); in(b);
    vector<pair<lint,lint>> y_prime=prime_factorize(y);
    bool f=true;
    rep(i,y_prime.size()){
        tie(p, n)=y_prime[i];
        m=div_much(p,x);
        if(m*a<n*b){
            f=false; break;
        }
    }
    f? out("Yes",endl):out("No",endl);

    return 0;
}