#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, hp, prev;
    std::cin >> n >> s >> b;
    int64_t alt = 0;
    hp = s;
    for(const auto i: iota(0, n)) {
        int h;
        std::cin >> h;
        if(i == 0) {
            alt = h;
            prev = h;
            continue;
        }
        const int need = std::max<int>(0, std::ceil(1.0L * (h - alt) / b));
        alt += std::min<int64_t>(hp, need) * b;
        hp -= need;
        if(alt < h) {
            alt = prev;
            hp = s;
            const int need = std::max<int>(0, std::ceil(1.0L * (h - alt) / b));
            alt += std::min<int64_t>(hp, need) * b;
            hp -= need;
            if(alt < h) {
                std::cout << "No\n";
                std::exit(0);
            }
        }
        prev = h;
    }
    std::cout << "Yes\n";
}