#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll n,s,b;
    cin>>n>>s>>b;
    vector<ll> h(n);
    
    for(int i = 0;i<n;i++) cin>>h[i];
    ll now = h[0];
    for(int i = 0;i<n;i++){
        if(now<h[i]){
            cout<<"No\n";
            return 0;
        }
        ll can = h[i] + b * s;
        now = max(now,can);
    }
    cout<<"Yes\n";
}