#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <set>
#include <random>
#include <iomanip>
#include <string>
#include <cmath>
#include <complex>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)

template<class T>
using vi = vector<T>;

template<class T>
using vii = vector<vi<T>>;

template<class T>
using viii = vector<vii<T>>;

using P = pair<ll, int>;

void chmin(ll & x, ll y) { x = min(x, y); }

void chmax(ll& x, ll y) { x = max(x, y); }

struct mint {
    const long long mod = 998244353;
    long long x;
    mint(long long x_ = 0) : x((x_% mod + mod) % mod) {}

    mint& operator+=(const mint& other) {
        x += other.x;
        if (x >= mod) x -= mod;
        return *this;
    }
    mint& operator-=(const mint& other) {
        x -= other.x;
        if (x < 0) x += mod;
        return *this;
    }
    mint& operator*=(const mint& other) {
        x *= other.x;
        x %= mod;
        return *this;
    }

    mint& operator+=(const long long n) {
        return *this += mint(n);
    }
    mint& operator-=(const long long n) {
        return *this -= mint(n);
    }
    mint& operator*=(const long long n) {
        return *this *= mint(n);
    }

    mint& operator=(const mint& other) {
        x = other.x;
        return *this;
    }
    mint& operator=(const long long n) {
        x = n % mod;
        return *this;
    }

    bool operator==(const mint& other) const {
        return x == other.x;
    }
    bool operator!=(const mint& other) const {
        return x != other.x;
    }

    mint operator-() const {
        mint res(mod - x);
        return res;
    }

    mint operator+(const mint& other) const {
        mint res(x);
        return res += other;
    }
    mint operator-(const mint& other) const {
        mint res(x);
        return res -= other;
    }
    mint operator*(const mint& other) const {
        mint res(x);
        return res *= other;
    }

    mint operator+(const long long n) const {
        mint res(x);
        mint other(n);
        return res += other;
    }
    mint operator-(const long long n) const {
        mint res(x);
        mint other(n);
        return res -= other;
    }
    mint operator*(const long long n) const {
        mint res(x);
        mint other(n);
        return res *= other;
    }

    mint pow(long long n) const {
        if (n == 0) return mint(1);
        mint res = pow(n / 2);
        res *= res;
        if (n % 2) res *= *this;
        return res;
    }
    mint inv() const {
        return pow(mod - 2);
    }
    mint& operator/=(const mint& other) {
        *this *= other.inv();
        return *this;
    }
    mint operator/(const mint& other) const {
        mint res(x);
        return res /= other;
    }
};

int main()
{
    int n;
    cin >> n;
    vi<ll> a(n);
    rep(i, n) cin >> a[i];

    mint ans = 1;
    rep(i, n - 1) ans *= min(a[i], a[i + 1]);
    cout << ans.x << endl;
    return 0;
}