#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#ifdef local
#include <C++/core/io/debug_print.hpp>
#else
#define dump(...) void(0);
#endif

#include <iostream>
#include <ranges>
#include <cmath>
namespace man {

}
int main() {
    std::cin.tie(nullptr) -> sync_with_stdio(false);
    using namespace std::views;
    int n, s, b;
    std::cin >> n >> s >> b;
    int64_t alt = 0;
    for([[maybe_unused]] const auto _: iota(0, n)) {
        int h;
        std::cin >> h;
        const int need = std::ceil(1.0L * (h - alt) / b);
        alt += std::min<int64_t>(s, need) * b;
        if(alt < h) {
            std::cout << "No\n";
            std::exit(0);
        }
        alt = h;
    }
    std::cout << "Yes\n";
}