#include <bits/stdc++.h>
using namespace std;

void fast_io() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
}

int main() {
	fast_io();
	int n, s;
	long long b;
	cin >> n >> s >> b;
	vector<long long> h(n);
	for (int i = 0; i < n; i++) {
		cin >> h[i];
	}
	for (int i = 1; i < n; i++) {
		if (h[i] < h[i - 1]) {
			h[i] = h[i - 1];
		}
		if ((h[i] - h[i - 1] + b - 1) / b > s) {
			cout << "No" << endl;
			return 0;
		}
	}
	cout << "Yes" << endl;
}