#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

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