#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
#define rep2(i, k, n) for (ll i = (ll)(k); i < (ll)(n); i++)
#define repM(i, k, n) for (ll i = (ll)(k); i > (ll)(n); i--)
#define all(v) v.begin(), v.end()
using ll = long long;
ll mod = 998244353;

int main() {
  ll N, S, B;
  cin >> N >> S >> B;
  vector<ll> H(N);
  rep(i, N){
    cin >> H[i];
  }

  ll now = H[0];
  rep2(i, 1, N){
    if(now >= H[i]){
      continue;
    } else if(now + S*B >= H[i]){
      now = H[i];
      continue;
    } else {
      cout << "No";
      return 0;
    }
  }
  cout << "Yes";
}