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

#define rep(i, n) for( ll i = 0; i < n; i++ )
using ll = long long;

int main() {
	int N, s, b;
	cin >> N >> s >> b;
	vector<int> h(N);
	rep(i, N) cin >> h[i];
	vector<int> dp(N);
	dp[0] = s;
	rep(i, N - 1) {
		int d = max(0, h[i + 1] - h[i]);
		int c = 0;
		if(d) c = (d + b - 1) / b;
		if(dp[i] < c) break;
		dp[i + 1] = s; 
	}
	string ans = "No";
	if(dp[N - 1] == s) ans = "Yes";
	cout << ans << endl;
}