typedef long long ll;
typedef long double ld;

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

signed main() {
    ll n,s,b;
    std::cin >> n>>s>>b;
    vector<ll> h(n);
    for (int i = 0; i < n; i++) {
        std::cin >> h[i];
    }
    bool out = false;
    ll now = h[0]+s*b;
    for (int i = 1; i < n; i++) {
        if(now<h[i]){
            out= true;
        }
        now = max(now, h[i]+s*b);
    }
    if(out){
        std::cout << "No" << std::endl;
    }else{
        std::cout << "Yes" << std::endl;
    }
};