#include<iostream>
#include<vector>
using namespace std;
int main()
{
  long long n,s,b;
  cin >> n >> s >> b;
  vector<long long>h(n);
  for(int i=0;i<n;i++)cin >> h[i];
  long long now=h[0]+s*b;
  bool ok=true;
  for(int i=1;i<n;i++){
    if(now<h[i]){
      ok=false;
      break;
    }
    now=max(now,h[i]+s*b);
  }
  if(ok)cout << "Yes" << endl;
  else cout << "No" << endl;
}