#if __INCLUDE_LEVEL__ == 0

#include __BASE_FILE__

namespace {

using mint = atcoder::modint998244353;

using Fps = std::vector<mint>;
int sz(const Fps& a) { return a.size(); }
Fps& operator-=(Fps& a, const Fps& b) {
  if (sz(a) < sz(b)) a.reserve(sz(b)), a.resize(sz(b));
  for (int i = 0; i < sz(b); ++i) a[i] -= b[i];
  return a;
}
Fps operator-(Fps a, const Fps& b) { return std::move(a -= b); }
Fps operator*(const Fps& a, const Fps& b) {
  Fps res = atcoder::convolution(a, b);
  res.resize(std::max(sz(a), sz(b)));
  return res;
}
Fps& operator*=(Fps& a, const Fps& b) { return a = a * b; }
Fps inv(const Fps& a) {
  Fps res{a[0].inv()};
  for (res.reserve(sz(a)); sz(res) < sz(a);) {
    res.resize(std::min(2 * sz(res), sz(a)));
    res *= Fps{2} - Fps(a.begin(), a.begin() + sz(res)) * res;
  }
  return res;
}

void solve() {
  mint p;
  scan(p);
  {
    mint t;
    scan(t);
    p /= t;
  }
  mint q;
  scan(q);
  {
    mint t;
    scan(t);
    q /= t;
  }
  int T;
  scan(T);

  Fps f(T + 2);
  f[0] = 1;
  for (const int i : rep1(T + 1)) {
    f[i] = q.pow(i * i64(i - 1) / 2);
    f[i] *= -p;
  }
  f = inv(f);
  print(p == 0 ? 0 : f[T + 1] / p);
}

}  // namespace

int main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  std::cout << std::setprecision(DBL_DECIMAL_DIG);

  solve();
}

#else  // __INCLUDE_LEVEL__

#include <bits/stdc++.h>

#include <atcoder/convolution>

template <class T, class U = T>
bool chmin(T& x, U&& y) {
  return y < x && (x = std::forward<U>(y), true);
}

template <class T, class U = T>
bool chmax(T& x, U&& y) {
  return x < y && (x = std::forward<U>(y), true);
}

template <std::signed_integral T = int>
T inf() {
  T ret;
  std::memset(&ret, 0x3f, sizeof(ret));
  return ret;
}

template <std::floating_point T>
T inf() {
  return std::numeric_limits<T>::infinity();
}

template <class T>
concept Range = std::ranges::range<T> && !std::convertible_to<T, std::string_view>;

template <class T>
concept Tuple = std::__is_tuple_like<T>::value && !Range<T>;

namespace std {

istream& operator>>(istream& is, Range auto&& r) {
  for (auto&& e : r) {
    is >> e;
  }
  return is;
}

istream& operator>>(istream& is, Tuple auto&& t) {
  return apply([&](auto&... xs) -> istream& { return (is >> ... >> xs); }, t);
}

ostream& operator<<(ostream& os, Range auto&& r) {
  for (string_view sep = ""; auto&& e : r) {
    os << exchange(sep, " ") << e;
  }
  return os;
}

ostream& operator<<(ostream& os, Tuple auto&& t) {
  const auto f = [&](auto&... xs) -> ostream& {
    [[maybe_unused]] string_view sep = "";
    ((os << exchange(sep, " ") << xs), ...);
    return os;
  };
  return apply(f, t);
}

template <class T, atcoder::internal::is_modint_t<T>* = nullptr>
istream& operator>>(istream& is, T& x) {
  int v;
  is >> v;
  x = T::raw(v);
  return is;
}

template <class T, atcoder::internal::is_modint_t<T>* = nullptr>
ostream& operator<<(ostream& os, const T& x) {
  return os << x.val();
}

}  // namespace std

void scan(auto&&... xs) { std::cin >> std::tie(xs...); }
void print(auto&&... xs) { std::cout << std::tie(xs...) << '\n'; }

template <class F>
class fix {
 public:
  explicit fix(F f) : f_(std::move(f)) {}

  decltype(auto) operator()(auto&&... xs) const {
    return f_(std::ref(*this), std::forward<decltype(xs)>(xs)...);
  }

 private:
  F f_;
};

inline auto rep(int l, int r) { return std::views::iota(std::min(l, r), r); }
inline auto rep(int n) { return rep(0, n); }
inline auto rep1(int l, int r) { return rep(l, r + 1); }
inline auto rep1(int n) { return rep(1, n + 1); }

namespace ranges = std::ranges;
namespace views = std::views;

using i64 = std::int64_t;

#endif  // __INCLUDE_LEVEL__