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

#ifdef _RUTHEN
#include <debug.hpp>
#else
#define show(...) true
#endif

#define REP(i, n) for (int i = 0; i < (n); i++)
template <class T> using V = vector<T>;

#include <atcoder/modint>
using mint = atcoder::modint998244353;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int N;
    cin >> N;
    vector<int> A(N);
    REP(i, N) cin >> A[i];
    mint ans = 1;
    REP(i, N - 1) ans *= min(A[i], A[i + 1]);
    cout << ans.val() << '\n';
    return 0;
}