#include <bits/stdc++.h>
#if __has_include(<atcoder/all>)
#include <atcoder/all>
std::ostream &operator<<(std::ostream &os, const atcoder::modint998244353 &v) {
    os << v.val();
    return os;
}
std::istream &operator>>(std::istream &is, atcoder::modint998244353 &v) {
    long long x;
    is >> x;
    v = x;
    return is;
}
std::ostream &operator<<(std::ostream &os, const atcoder::modint1000000007 &v) {
    os << v.val();
    return os;
}
std::istream &operator>>(std::istream &is, atcoder::modint1000000007 &v) {
    long long x;
    is >> x;
    v = x;
    return is;
}
#endif

using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define rep(i, s, t) for (ll i = s; i < (ll)(t); i++)
#define rrep(i, s, t) for (ll i = (ll)(t) - 1; i >= (ll)(s); i--)
#define all(x) begin(x), end(x)

#define TT template <typename T>
TT using vec = vector<T>;
TT using vvec = vec<vec<T>>;
TT using vvvec = vec<vvec<T>>;
TT using minheap = priority_queue<T, vector<T>, greater<T>>;
TT using maxheap = priority_queue<T>;
template <class T1, class T2> bool chmin(T1 &x, T2 y) {
    return x > y ? (x = y, true) : false;
}
template <class T1, class T2> bool chmax(T1 &x, T2 y) {
    return x < y ? (x = y, true) : false;
}
struct io_setup {
    io_setup() {
        ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
        cout << fixed << setprecision(15);
    }
} io_setup;

template <class T1, class T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) {
    os << p.first << " " << p.second;
    return os;
}

TT ostream &operator<<(ostream &os, const vec<T> &v) {
    for (size_t i = 0; i < v.size(); i++) {
        os << v[i] << (i + 1 != v.size() ? " " : "");
    }
    return os;
}

template <typename T, ll n>
ostream &operator<<(ostream &os, const array<T, n> &v) {
    for (size_t i = 0; i < n; i++) {
        os << v[i] << (i + 1 != n ? " " : "");
    }
    return os;
}

template <typename T> std::ostream &operator<<(ostream &os, const vvec<T> &v) {
    for (size_t i = 0; i < v.size(); i++) {
        os << v[i] << (i + 1 != v.size() ? "\n" : "");
    }
    return os;
}

TT istream &operator>>(istream &is, vec<T> &v) {
    for (size_t i = 0; i < v.size(); i++) {
        is >> v[i];
    }
    return is;
}

#if __has_include(<debug/debug.hpp>)
#include <debug/debug.hpp>
#else
#define dbg(...) true
#define DBG(...) true
#endif
// 動的mod : template<int mod> を消して、上の方で変数modを宣言
template <uint32_t mod> struct modint {
    using mm = modint;
    uint32_t x;
    modint() : x(0) {}
    TT modint(T a = 0) : x((ll(a) % mod + mod)) {
        if (x >= mod) x -= mod;
    }

    friend mm operator+(mm a, mm b) {
        a.x += b.x;
        if (a.x >= mod) a.x -= mod;
        return a;
    }
    friend mm operator-(mm a, mm b) {
        a.x -= b.x;
        if (a.x >= mod) a.x += mod;
        return a;
    }

    //+と-だけで十分な場合、以下は省略して良いです。

    friend mm operator*(mm a, mm b) { return (uint64_t)(a.x) * b.x; }
    friend mm operator/(mm a, mm b) { return a * b.inv(); }
    friend mm &operator+=(mm &a, mm b) { return a = a + b; }
    friend mm &operator-=(mm &a, mm b) { return a = a - b; }
    friend mm &operator*=(mm &a, mm b) { return a = a * b; }
    friend mm &operator/=(mm &a, mm b) { return a = a * b.inv(); }

    mm inv() const { return pow(mod - 2); }
    mm pow(ll y) const {
        mm res = 1;
        mm v = *this;
        while (y) {
            if (y & 1) res *= v;
            v *= v;
            y /= 2;
        }
        return res;
    }

    friend istream &operator>>(istream &is, mm &a) {
        ll t;
        cin >> t;
        a = mm(t);
        return is;
    }

    friend ostream &operator<<(ostream &os, mm a) { return os << a.x; }

    bool operator==(mm a) { return x == a.x; }
    bool operator!=(mm a) { return x != a.x; }

    bool operator<(const mm &a) const { return x < a.x; }
};
using modint998244353 = modint<998244353>;
using modint1000000007 = modint<1'000'000'007>;
/*
@brief modint
*/
using mint = modint998244353;

int main() {
    ll n;
    cin >> n;
    vec<ll> A(n);
    rep(i, 0, n) cin >> A[i];
    mint res = 1;
    rep(i, 0, n - 1) res *= min(A[i], A[i + 1]);
    cout << res << endl;

}