#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
template <class T>
using V = vector<T>;
const ll inf = (1e18);
ll mod = 998244352;
const vector<int> dy = {-1, 0, 1, 0}, dx = {0, -1, 0, 1};
ll GCD(ll a, ll b) { return b ? GCD(b, a % b) : a; }
ll LCM(ll c, ll d) { return c / GCD(c, d) * d; }
struct __INIT {
  __INIT() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(15);
  }
} __init;
template <class T>
bool chmax(T &a, const T &b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T>
bool chmin(T &a, const T &b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T>
void debag(const vector<T> &a) {
  cerr << "debag :";
  for (auto v : a) cerr << v << " ";
  cerr << "\n";
}
template <class T>
void print(const vector<T> &a) {
  for (auto v : a) cout << v << " ";
  cout << "\n";
}
struct mint {
  using ull = unsigned long long int;
  ull v;
  mint(ll vv = 0) { s(vv % mod + mod); }
  mint &s(ull vv) {
    v = vv < mod ? vv : vv - mod;
    return *this;
  }
  mint operator-() const { return mint() - *this; }
  mint &operator+=(const mint &val) { return s(v + val.v); }
  mint &operator-=(const mint &val) { return s(v + mod - val.v); }
  mint &operator*=(const mint &val) {
    v = ull(v) * val.v % mod;
    return *this;
  }
  mint &operator/=(const mint &val) { return *this *= val.inv(); }
  mint operator+(const mint &val) { return mint(*this) += val; }
  mint operator-(const mint &val) { return mint(*this) -= val; }
  mint operator*(const mint &val) { return mint(*this) *= val; }
  mint operator/(const mint &val) { return mint(*this) /= val; }
  mint pow(ll n) const {
    mint res(1), x(*this);
    while (n) {
      if (n & 1) res *= x;
      x *= x;
      n >>= 1ll;
    }
    return res;
  }
  mint inv() const { return pow(mod - 2); }
  friend ostream &operator<<(ostream &os, const mint &val) {
    return os << val.v;
  }
  bool operator<(const mint &val) const { return v < val.v; }
  bool operator==(const mint &val) const { return v == val.v; }
  bool operator>(const mint &val) const { return v > val.v; }
};
template <class T>
struct Matrix {
  vector<vector<T>> A;
  Matrix() {}
  Matrix(size_t n, size_t m) : A(n, vector<T>(m, 0)) {}
  Matrix(size_t n) : A(n, vector<T>(n, 0)) {}
  size_t height() const { return (A.size()); }
  size_t width() const { return (A[0].size()); }
  inline const vector<T> &operator[](int k) const { return (A.at(k)); }
  inline vector<T> &operator[](int k) { return (A.at(k)); }
  static Matrix I(size_t n) {
    Matrix mat(n);
    for (int i = 0; i < n; i++) mat[i][i] = (T)(1);
    return mat;
  }
  Matrix &operator+=(const Matrix &B) {
    size_t n = height(), m = width();
    assert(n == B.height() && m == B.width());
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < m; j++) {
        (*this)[i][j] += B[i][j];
      }
    }
    return (*this);
  }
  Matrix &operator-=(const Matrix &B) {
    size_t n = height(), m = width();
    assert(n == B.height() && m == B.width());
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < m; j++) {
        (*this)[i][j] -= B[i][j];
      }
    }
    return (*this);
  }
  Matrix &operator*=(const Matrix &B) {
    size_t n = height(), m = B.width(), w = height();
    assert(w == B.height());
    vector<vector<T>> C(n, vector<T>(m, 0));
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < m; j++) {
        for (int k = 0; k < w; k++) {
          C[i][j] += (*this)[i][k] * B[k][j];
        }
      }
    }
    A.swap(C);
    return (*this);
  }
  Matrix &operator^=(long long k) {
    Matrix B = Matrix::I(height());
    while (k > 0) {
      if (k & 1) {
        B *= (*this);
      }
      (*this) *= (*this);
      k >>= 1ll;
    }
    A.swap(B.A);
    return (*this);
  }
  Matrix operator+(const Matrix &B) const { return (Matrix(*this) += B); }
  Matrix operator-(const Matrix &B) const { return (Matrix(*this) -= B); }
  Matrix operator*(const Matrix &B) const { return (Matrix(*this) *= B); }
  Matrix operator^(const long long k) const { return (Matrix(*this) ^= k); }
  friend ostream &operator<<(ostream &os, Matrix &mat) {
    size_t n = mat.height(), m = mat.width();
    for (int i = 0; i < n; i++) {
      os << "[";
      for (int j = 0; j < m; j++) {
        os << mat[i][j] << (j + 1 == m ? "]\n" : ",");
      }
    }
    return (os);
  }
  T det() {
    Matrix B(*this);
    assert(height() == width());
    T ret = (T)(1);
    for (int i = 0; i < width(); i++) {
      int idx = -1;
      for (int j = i; j < width(); j++) {
        if (B[j][i] != 0) idx = j;
      }
      if (idx == -1) return (T)(0);
      if (i != idx) {
        ret *= (T)(-1);
        swap(B[i], B[idx]);
      }
      ret *= B[i][i];
      T v = B[i][i];
      for (int j = 0; j < width(); j++) {
        B[i][j] /= v;
      }
      for (int j = i + 1; j < width(); j++) {
        T a = B[j][i];
        for (int k = 0; k < width(); k++) {
          B[j][k] -= B[i][k] * a;
        }
      }
    }
    return (ret);
  }
};
int main() {
  int n;
  cin >> n;
  V<int> a(n);
  for (int i = 0; i < n; i++) cin >> a[i];
  Matrix<mint> res(n, 1), rec(n);
  for (int i = 0; i < n; i++) {
    rec[0][i] = mint(a[i]);
  }
  for (int i = 1; i < n; i++) {
    rec[i][i - 1] = 1;
  }
  res[0][0] = 1;
  ll v, val;
  cin >> v >> val;
  rec ^= (v - n);
  rec *= res;
  ll k = rec[0][0].v;
  mod++;
  mint ans = mint(3).pow(k), tmp = mint(1);
  if (val == 1) {
    cout << 1 << "\n";
    return 0;
  }
  map<ll, ll> mp;
  ll sq;
  for (ll i = 1; i * i <= mod; i++) {
    sq = i;
    if ((sq + 1) * (sq + 1) > mod) break;
    tmp *= ans;
    if (!mp.count(tmp.v)) mp[tmp.v] = i;
  }
  sq--;
  mint r = tmp.inv(), cp = mint(val);
  for (ll i = 0; i <= sq; i++) {
    if (mp.count(cp.v)) {
      cout << mint(3).pow(mp[cp.v] + i * sq) << "\n";
      return 0;
    }
    cp *= r;
  }
  cout << -1 << "\n";
}
