#include<bits/stdc++.h>
using namespace std;
#define rep(i,n,k); for(ll i = k; i < (int)(n); i++)
#define rep1(i, n) for(ll i = 0; i < (n); ++i)
using ll = long long;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

int main() {
 ll N,S,B;
 cin>>N>>S>>B;
 vector<ll>vec(N);
 rep(i,N,0)cin>>vec[i];
 ll now=vec[0];
 rep(i,N,1){
 	if(vec[i]>now+S*B){
 		cout<<"No"<<endl;
 		return 0;
 	}
 	now=vec[i];
 }
 cout<<"Yes"<<endl;
}