#include <bits/stdc++.h>
using namespace std;
int main(){
	int N, S, B;
	cin >> N >> S >> B;
	vector<int> H(N);
	for (int i = 0; i < N; i++){
		cin >> H[i];
	}
	bool ok = true;
	int nowH = H[0], nowS = S;
	for (int i = 0; i < N - 1; i++){
		while (nowS > 0 and nowH < H[i + 1]){
			nowS--;
			nowH += B;
		}
		if (nowH < H[i + 1]){
			nowS = S;
			nowH = H[i];
			while (nowS > 0 and nowH < H[i + 1]){
				nowS--;
				nowH += B;
			}
			if (nowH < H[i + 1]){
				ok = false;
				break;
			}
		}
	}
	if (ok){
		cout << "Yes" << endl;
	} else {
		cout << "No" << endl;
	}
}