#include<bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
	int n,s,b;
	cin >> n >> s >> b;
	vector<int> a(n);
	cin >> a[0];
	int t = a[0], e = s;
	for(int i = 1; i < n; i++) {
		cin >> a[i];
		if(e*b < a[i]-t) {
			cout << "No" << endl;
			return 0;
		}
		if(a[i]+s*b >= t+e*b) {
			t = a[i];
			e = s;
		}
		else {
			t = t+e*b;
			e = 0;
		}
	}
	cout << "Yes" << endl;
}