#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define REP(i, x, y) for (auto i = (x); i < (y); i++)
#define RREP(i, x, y) for (auto i = (y) - 1; (x) <= i; i--)
#define ALL(x) (x).begin(), (x).end()
#pragma GCC optimize("O3")
template<class T>
bool chmax(T &a, const T b){
  if(a < b){
    a = b;
    return true;
  }
  return false;
}
int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll N, S, B;
  cin >> N >> S >> B;
  vector<ll> H(N);
  REP(i, 0, N){
    cin >> H[i];
  }
  ll ma = H[0];
  REP(i, 1, N){
    if(ma + S * B < H[i]){
      cout << "No\n";
      return 0;
    }
    chmax(ma, H[i]);
  }
  cout << "Yes\n";
  return 0;
}
/*
  File : ~/yukicoder/midoriika_3rd/D.cpp
  Date : 2024/10/12
  Time : 14:37:49
*/