#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#include<ext/pb_ds/tag_and_trait.hpp>
using namespace std;
using namespace __gnu_pbds;

#define rep(i,n) for(int i = 0;i<(n);i++)
#define per(i,n) for(int i = (n-1);i>=0;i--)
#define nfor(i,b,e) for(int i = b;i<(e);i++)
#define Sort(a) sort((a).begin(), (a).end())
#define Rev(a) reverse((a).begin(), (a).end())
#define all(...) std::begin(__VA_ARGS__), std::end(__VA_ARGS__)
#define rall(...) std::rbegin(__VA_ARGS__), std::rend(__VA_ARGS__)//reverseしてからall
#define endl '\n'
#define YesNo(bool) if(bool){cout<<"Yes"<<endl;}else{cout<<"No"<<endl;}

#include <limits>
// Tu は最大値のある符号無し整数型 (型チェックに必要な static_assert などは省略)
template <typename Tu>
static inline constexpr bool is_multiplication_safe(Tu a, Tu b){
    return !a || b <= std::numeric_limits<Tu>::max() / a;
}

template <typename Tu>
static inline constexpr bool is_addition_safe(Tu a, Tu b){
    if(a*b <= 0) return true;
    else if(a<0 && b<0) return b >= std::numeric_limits<Tu>::max() - a;
    else if(a>0 && b>0) return b <= std::numeric_limits<Tu>::max() - a;
}

//O(NlogN)の計算量が必要
template <typename T>
double median(std::vector<T> numbers) {

    std::sort(numbers.begin(), numbers.end());

    size_t size = numbers.size();
    if (size % 2 == 0) return (numbers[size / 2 - 1] + numbers[size / 2]) / 2.0;
    else return numbers[size / 2];
}

#ifdef _DEBUG
//vectorの要素を列挙
#define debug(x) cout<<#x<<": "<<x<<'\n'
template <typename T>
void debugv(const vector<T>& vec) {
    for (const auto& element : vec) cout << element << " ";
    cout << endl;
}

//2次元vectorの要素を列挙
template <typename T>
void debugvv(const vector<vector<T>>& vec) {
    for (const auto& e1 : vec) {
        for(const auto& e2:e1) cout << e2 << " ";
        cout << endl;
    }
    cout << endl;
}
#else
#define debug(x)
#define debugv(x)
#define debugvv(x)
#endif

typedef long long ll;
typedef unsigned long long ull;
//<int>を<使いたい型>に書き変える
//*orderd_set.find_by_order(i)で値を取得する。
using  ordered_set =  tree<char, null_type, less<char>, rb_tree_tag, tree_order_statistics_node_update>;
using vi = vector<int>;
using vc = vector<char>;
using vvi = vector<vector<int>>;
using vvc = vector<vector<char>>;
using vvvi = vector<vector<vector<int>>>;
using vll = vector<ll>;
using vvll = vector<vector<ll>>;
using Pii = pair<int,int>;
#define make(x,y) make_pair(x,y)

//vector to string
string to_string(vector<int> a){
    int n = a.size();
    string res = "";
    rep(i,n) res += char(a[i]+'0');
    return res;
}

long double euclid_dist(long double xi,long double yi,long double xj,long double yj){
    return sqrt((xi-xj)*(xi-xj)+(yi-yj)*(yi-yj));
}

ull factorial(int n){
    if(n==0||n==1) return 1ULL;
    else return factorial(n-1)*n;
}

template<int MOD>
struct ModInt {
	static const int Mod = MOD;
	unsigned x;
	ModInt() : x(0) { }
	ModInt(signed sig) { int sigt = sig % MOD; if (sigt < 0) sigt += MOD; x = sigt; }
	ModInt(signed long long sig) { int sigt = sig % MOD; if (sigt < 0) sigt += MOD; x = sigt; }
	int get() const { return (int)x; }

	ModInt &operator+=(ModInt that) { if ((x += that.x) >= MOD) x -= MOD; return *this; }
	ModInt &operator-=(ModInt that) { if ((x += MOD - that.x) >= MOD) x -= MOD; return *this; }
	ModInt &operator*=(ModInt that) { x = (unsigned long long)x * that.x % MOD; return *this; }

	ModInt operator+(ModInt that) const { return ModInt(*this) += that; }
	ModInt operator-(ModInt that) const { return ModInt(*this) -= that; }
	ModInt operator*(ModInt that) const { return ModInt(*this) *= that; }
};
using mint =  ModInt<1000000007>;


int main(){
    ios::sync_with_stdio(false);
	cin.tie(nullptr);
    //dpだろ！
    int n,s,b;cin >> n >> s >>b;
    vi h(n); rep(i,n)cin >> h[i];
    //着地すると回復する？
    //n==1に気を付けたい
    if(n==1) YesNo(true);
    vi diff(n-1); rep(i,n-1) diff[i] = h[i+1]-h[i];
    bool ans = true;
    rep(i,n-1) if(diff[i]>s*b) ans = false;
    YesNo(ans); 
    return 0;
}