#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define _GLIBCXX_DEBUG
using namespace std;
using std::cout;
using std::cin;
using std::endl;
using ll=long long;
using ld=long double;
ll ILL=1167167167167167167;
const int INF=2100000000;
const ll mod=1e9+7;
#define rep(i,a) for (ll i=0;i<a;i++)
template<class T> using _pq = priority_queue<T, vector<T>, greater<T>>;
template<class T> ll LB(vector<T> &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> ll UB(vector<T> &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> bool chmin(T &a,const T &b){if(a>b){a=b;return 1;}else return 0;}
template<class T> bool chmax(T &a,const T &b){if(a<b){a=b;return 1;}else return 0;}
template<class T> void So(vector<T> &v) {sort(v.begin(),v.end());}
template<class T> void Sore(vector<T> &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});}
void yneos(bool a){if(a) cout<<"Yes\n"; else cout<<"No\n";}

// return val=p(N)
// a=p[0].first^p[0].second * ... *p[N-1].first^p[N-1].second
// for all i: p[i].first is prime number
// O(sqrt(val))
std::vector<std::pair<long long,long long>> Prime_factorization(long long val){
	assert(val>=1);
	if(val==1){
		return {{1,1}};
	}
	int ind=0;
	std::vector<std::pair<long long,long long>> ans;
	for(long long i=2;i*i<=val;i++){
		if(val%i!=0) continue;
		ans.push_back({i,0});
		while(val%i==0){
			ans[ind].second++;
			val/=i;
		}
		ind++;
	}
	if(val!=1) ans.push_back({val,1});
	return ans;
}
 

//  rainy ~ 雨に打たれて ~
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	ll X,A,Y,B;
	cin>>X>>A>>Y>>B;
	bool T=1;
	auto p=Prime_factorization(X);
	auto q=Prime_factorization(Y);
	map<ll,ll> m;
	for(auto x:p) m[x.first]=x.second*A;
	for(auto x:q){
		if(m[x.first]<B*x.second) T=0;
	}
	yneos(T);
}