#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define R cin>>
#define Z class
#define ll long long
#define ln cout<<'\n'
#define in(a) insert(a)
#define pb(a) push_back(a)
#define pd(a) printf("%.10f\n",a)
#define mem(a) memset(a,0,sizeof(a))
#define all(c) (c).begin(),(c).end()
#define iter(c) __typeof((c).begin())
#define rrep(i,n) for(ll i=(ll)(n)-1;i>=0;i--)
#define REP(i,m,n) for(ll i=(ll)(m);i<(ll)(n);i++)
#define rep(i,n) REP(i,0,n)
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
void pr(){ln;}
template<Z A,Z...B>void pr(const A &a,const B&...b){cout<<a<<' ';pr(b...);}
template<Z A>void PR(A a,ll n){rep(i,n){if(i)cout<<' ';cout<<a[i];}ln;}
ll check(ll n,ll m,ll x,ll y){return x>=0&&x<n&&y>=0&&y<m;}
const ll MAX=1e9+7,MAXL=1LL<<61,dx[8]={-1,0,1,0,-1,-1,1,1},dy[8]={0,1,0,-1,-1,1,1,-1};
typedef pair<ll,ll> P;

void Main() {
  ll l,r,m,k;
  cin >> l >> r >> m >> k;
  if(l/m!=r/m||l%m==0) {
    pr("Yes");
    return;
  }
  l%=m,r%=m;
  ll x=ceil((double)m/l),y=ceil((double)m/r);
  if(k%x==0||k/x!=k/y) pr("Yes");
  else pr("No");
}

int main(){ios::sync_with_stdio(0);cin.tie(0);Main();return 0;}