#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<bitset>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<deque>
#include<list>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<functional>
#include<cstdio>
#include<cstdlib>
using namespace std;

#define repr(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define rep(i, n) repr(i, 0, n)
#define INF 2e9
#define MOD 1000000007
//#define MOD 998244353
#define LINF (long long)4e18
#define jck 3.141592

const double EPS = 1e-10;

using ll = long long;
using Pi = pair<int,int>;
using Pl = pair<ll,ll>;

int main(){
  int l,r,m,k; cin >> l >> r >> m >> k;
  ll a = (ll)l*k;
  ll b = (ll)r*k;
  if(a % m == 0 || b % m == 0 || a%m > b%m){
    cout << "Yes" << endl;
    return 0;
  }
  if(b-a < m){
    cout << "No" << endl;
    return 0;
  }
  cout << "Yes" << endl;
}