#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll=long long;
using Graph=vector<vector<int>>;
#define INF 1000000000
#define MOD 998244353
#define MAX 200000

int main(){
  ll X,A,Y,B;
  cin>>X>>A>>Y>>B;

  map<ll,ll> m1,m2;
  for(ll i=2;i<=1000000;i++){
    while(X%i==0){
      m1[i]+=A;
      X/=i;
    }
    while(Y%i==0){
      m2[i]+=B;
      Y/=i;
    }
  }

  for(auto [p,cnt]:m2){
    if(cnt>m1[p]){
      cout<<"No"<<'\n';
      return 0;
    }
  }
  cout<<"Yes"<<'\n';
}