#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <string>
#include <utility>
#include <tuple>
#include <set>
#include <map>
#include <cassert>

using namespace std;

// 最大たかさにいく、高さ更新できるなら足場に移動して更新する

int main() {
	int n;
	long long s, b;
	cin >> n >> s >> b;

	vector<long long> h(n, 0);
	for (int i = 0; i < n; i++) {
		cin >> h[i];
	}

	bool ok = true;
	long long height = h[0];
	for (int i = 0; i < n; i++) {

		// fprintf(stderr, "i %d, height %lld, h[i] %lld\n", i, height, h[i]);

		if (height < h[i]) {
			ok = false;
			break;
		}

		height = max(height, h[i] + b*s);
	}

	cout << (ok ? "Yes" : "No") << endl;
	return 0;
}