#include <iostream>
#include <vector>

using namespace std;
typedef long long ll;
ll h[200010];
int main(){
    ll i,n,s,b; cin >> n >> s >> b;
    for(i=0;i<n;i++) cin >> h[i];
    vector<ll> v = {h[0]};
    for(i=1;i<n;i++){
        if(v.back()<h[i]) v.push_back(h[i]);
    }
    for(i=1;i<n;i++){
        if(v[i] - v[i - 1]>s*b){
            cout << "No\n";
            return 0;
        }
    }
    cout << "Yes\n";
}