#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i < n; i++)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;
using ld = long double;

int main() {
    int n;
    lint s, b;
    cin >> n >> s >> b;
    vector<lint> h(n);
    rep(i, n) {
        cin >> h[i];
    }
    lint nh = h[0] + b * s;
    for (int i = 1; i < n; i++) {
        if (nh < h[i]) {
            cout << "No" << endl;
            return 0;
        }
        nh = max(nh, h[i] + b * s);
    }
    cout << "Yes" << endl;
}