#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;
template <class T> using V=vector<T>;
template <class T> using VV=V<V<T>>;

int dp[200200];
 
int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  
  ll n,s,b;
  cin>>n>>s>>b;
  V<ll> H(n);
  rep(i,n) cin>>H[i];
  
  dp[0]=1;
  rep(i,n-1){
    if(dp[i]==0) continue;
    for(int j=1;j<=s && i+j<=n-1;j++){
      if(H[i+j]>H[i]+s*b) break;
      dp[i+j]=1;
    }
  }
  if(dp[n-1]) cout<<"Yes\n";
  else cout<<"No\n";
    
  return 0;
}