#include <iostream>
#include <string>
#include <algorithm>
#include <functional>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <tuple>
#include <cstdio>
#include <cmath>
#include <cassert>
#define rep(i, n) for(i = 0; i < n; i++)
#define int long long
using namespace std;

int n, s, b;
int h[200000];

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

    cout << "Yes" << endl;
    return 0;
}