#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int n, s, b;
  cin >> n >> s >> b;
  const int inits = s;
  vector<int> a(n);
  rep(i, n) cin >> a[i];
  int now = 0;
  rep(i, n) {
    if (i == n - 1) {
      cout << "Yes" << endl;
      break;
    }
    if (a[i + 1] >= now) {
      if (s < (a[i + 1] - now + b - 1) / b) {
        cout << "No" << endl;
        break;
      }
      s = inits;
      now = a[i + 1];
    }
  }
  return 0;
}