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

#include <bits/stdc++.h>
#include <atcoder/modint>
using namespace std;
using mint = atcoder::modint998244353;

class FPC{
    private:
    int size;
    vector<mint> ff, fi;
    public:
    FPC(int _n = 0) : size(_n), ff(_n + 1), fi(_n + 1){
        ff[0] = fi[0] = 1;
        for(int i = 1;i <= size;i++){
            ff[i] = ff[i - 1] * i;
            fi[i] = ff[i].inv();
        }
    }
    mint fact(int n) const{
        assert(0 <= n && n <= size);
        return ff[n];
    }
    mint faci(int n) const{
        assert(0 <= n && n <= size);
        return fi[n];
    }
    mint parm(int n, int r) const{
        assert(0 <= n && n <= size);
        assert(0 <= r && r <= size);
        return ff[n] * fi[r];
    }
    mint comb(int n, int r) const{
        assert(0 <= n && n <= size);
        assert(0 <= r && r <= size);
        assert(n >= r);
        return ff[n] * fi[r] * fi[n - r];
    }
};
int N;
int A[210];
int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    cin >> N;
    for(int i = 0;i < N;i++)cin >> A[i];
    int n = (int)1e5 + 1;
    for(int i = 0;i < N;i++){
        n -= max(0, A[i] - A[i + 1]);
    }
    FPC fpc(n + N);
    mint ans = (n < N ? 0 : fpc.comb(n + N - 1, N));
    cout << ans.val() << endl;
    return 0;
}