#include <bits/stdc++.h>
#define rep(i,n) for (int (i) = 0; (i) < (n); i++)
#define ll long long
using namespace std;

int main(){
  ll l,r,m,k;
  cin>>l>>r>>m>>k;
  ll n=0;
  for(ll i=l;i<r+1;i++){
    for(ll kai=1;kai<k+1;k++){
      n=(n+i)%m;
      if(n==0){
        cout<<"Yes"<<endl;
        return 0;
      }
    }
  }
  cout<<"No"<<endl;
}