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

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

    long long N,S,B; cin >> N >> S >> B;
    long long now; cin >> now; now += B*S;
    for(int i=1; i<N; i++){
        long long h; cin >> h;
        if(h > now){cout << "No\n"; return 0;}
        now = max(now,h+B*S);
    }
    cout << "Yes\n";
}