#include <bits/stdc++.h>
using namespace std;

template <class F> class y_combinator {
    F f;

   public:
    y_combinator(F&& f) : f(std::forward<F>(f)) {}
    template <class... Args> auto operator()(Args&&... args) const { return f(*this, std::forward<Args>(args)...); }
};

using ll = long long;
using u32 = unsigned int;
using u64 = unsigned long long;

using vi = vector<int>;
using vl = vector<ll>;
template <class T> using vc = vector<T>;
template <class T> using vvc = vector<vc<T>>;
template <class T, class U = std::less<T>> using prique = priority_queue<T, vector<T>, U>;

#define overload(a, b, c, d, e, ...) e
#define len(x) (ll)(x.size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define rep1(n) for (ll _ = 0; _ < ll(n); _++)
#define rep2(i, n) for (ll i = 0; i < ll(n); i++)
#define rep3(i, a, b) for (ll i = ll(a); i < ll(b); i++)
#define rep4(i, a, b, c) for (ll i = ll(a); i < ll(b); i += ll(c))
#define rep(...) overload(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)

template <class T> void dedup(vector<T>& a) { sort(all(a)), a.erase(unique(all(a)), a.end()); }
template <class T> bool chmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
template <class T> bool chmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }

namespace cppio {

template <typename T> struct is_tuple_like : false_type {};
template <typename... Ts> struct is_tuple_like<tuple<Ts...>> : true_type {};
template <typename T, typename U> struct is_tuple_like<pair<T, U>> : true_type {};

template <typename T, typename = void> struct is_container : false_type {};
template <typename T> struct is_container<T, void_t<decltype(begin(declval<T&>()))>> : bool_constant<!is_same_v<decay_t<T>, string>> {};

template <typename T> void _in(T& x) {
    if constexpr (is_tuple_like<T>::value) apply([](auto&... elems) { (_in(elems), ...); }, x);
    else if constexpr (is_container<T>::value) {
        for (auto& e : x) {
            _in(e);
        }
    } else cin >> x;
}

template <typename... Ts> void _in_all(Ts&... args) { (_in(args), ...); }

template <typename T> void _out(const T& x) {
    if constexpr (is_tuple_like<T>::value) {
        bool first = true;
        apply([&](const auto&... elems) { ((cout << (first ? "" : " "), _out(elems), first = false), ...); }, x);
    } else if constexpr (is_container<T>::value) {
        bool first = true;
        for (const auto& e : x) {
            if (!first) cout << ' ';
            _out(e);
            first = false;
        }
    } else cout << x;
}

template <typename... Ts> void _out_all(const Ts&... args) {
    bool first = true;
    ((cout << (first ? "" : " "), _out(args), first = false), ...);
    cout << '\n';
}
template <typename... Ts> void _out_no_el(const Ts&... args) {
    bool first = true;
    ((cout << (first ? "" : " "), _out(args), first = false), ...);
}

}  // namespace cppio

#define IN(...) cppio::_in_all(__VA_ARGS__)
#define OUT(...) cppio::_out_all(__VA_ARGS__)
#define out(...) cppio::_out_no_el(__VA_ARGS__)
#define INT(...)     \
    int __VA_ARGS__; \
    IN(__VA_ARGS__)
#define LL(...)     \
    ll __VA_ARGS__; \
    IN(__VA_ARGS__)
#define STR(...)        \
    string __VA_ARGS__; \
    IN(__VA_ARGS__)
#define CHR(...)      \
    char __VA_ARGS__; \
    IN(__VA_ARGS__)
#define DBL(...)        \
    double __VA_ARGS__; \
    IN(__VA_ARGS__)
#define VEC(type, name, size) \
    vector<type> name(size);  \
    IN(name)
#define VV(type, name, h, w)                       \
    vector<vector<type>> name(h, vector<type>(w)); \
    IN(name)
#define EXIT(...)    \
    do {             \
        __VA_ARGS__; \
        return;      \
    } while (0)
void Yes(bool b = true) { OUT(b ? "Yes" : "No"); }
void No(bool b = true) { Yes(!b); }
void YES(bool b = true) { OUT(b ? "YES" : "NO"); }
void NO(bool b = true) { YES(!b); }
void solve() {
    INT(A, B, C, D, S);
    Yes(A * C + B * D <= S);
}
int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    ll t = 1;
    while (t--) solve();
}