#include<bits/stdc++.h>
using namespace std;
using ll=long long;
constexpr int MOD=998244353;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep2(i,l,r) for(int i=(l);i<(int)(r);i++)
#define all(v) v.begin(),v.end()

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll N,S,B;
  cin>>N>>S>>B;
  vector H(N,0ll);
  for(ll &i:H)cin>>i;
  ll mH=H[0]+S*B;
  rep2(i,1,N){
    if(mH<H[i]){
      cout<<"No\n";
      return 0;
    }
    mH=max(mH,H[i]+S*B);
  }
  cout<<"Yes\n";
}