#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll,ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
#define REP(i,n) for(ll i=0;i<(n);i++)
#define ALL(v) v.begin(),v.end()
template<typename T> bool chmax(T &x, const T &y) {return (x<y)?(x=y,true):false;};
template<typename T> bool chmin(T &x, const T &y) {return (x>y)?(x=y,true):false;};
constexpr ll MOD=998244353;
constexpr ll INF=2e18;

int main(){
    ll x, a, y, b;
    cin >> x >> a >> y >> b;
    if(y==1){
        cout << "Yes" << endl;
        return 0;
    }
    if(x==1){
        if(y==1)
            cout << "Yes" << endl;
        else
            cout << "No" << endl;
        return 0;
    }
    ll cnt=0;
    if(x%y==0){
        while(x%y==0){
            x/=y;
            cnt++;
        }
        if(a*cnt>=b)
            cout << "Yes" << endl;
        else
            cout << "No" << endl;
    }
    else if(y%x==0){
        while(y%x==0){
            y/=x;
            cnt++;
        }
        if(a>=b*cnt&&y==1)
            cout << "Yes" << endl;
        else
            cout << "No" << endl;
    }
    else
        cout << "No" << endl;
}