#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second
mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
const ll MOD1000000007 = 1000000007;
const ll MOD998244353 = 998244353;
const ll MOD[3] = {999727999, 1070777777, 1000000007};
const ll LINF = 1LL << 60LL;
const int IINF = (1 << 30) - 1;


template<long long mod>
class modint{
    long long x;
public:
    modint(long long x=0) : x((x%mod+mod)%mod) {}
    modint operator-() const { 
      return modint(-x);
    }
    bool operator==(const modint& a){
        if(x == a) return true;
        else return false;
    }
    bool operator==(long long a){
        if(x == a) return true;
        else return false;
    }
    bool operator!=(const modint& a){
        if(x != a) return true;
        else return false;
    }
    bool operator!=(long long a){
        if(x != a) return true;
        else return false;
    }
    modint& operator+=(const modint& a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }
    modint& operator-=(const modint& a) {
        if ((x += mod-a.x) >= mod) x -= mod;
        return *this;
    }
    modint& operator*=(const  modint& a) {
        (x *= a.x) %= mod;
        return *this;
    }
    modint operator+(const modint& a) const {
        modint res(*this);
        return res+=a;
    }
    modint operator-(const modint& a) const {
        modint res(*this);
        return res-=a;
    }
    modint operator*(const modint& a) const {
        modint res(*this);
        return res*=a;
    }
    modint pow(long long t) const {
        if (!t) return 1;
        modint a = pow(t>>1);
        a *= a;
        if (t&1) a *= *this;
        return a;
    }
    // for prime mod
    modint inv() const {
        return pow(mod-2);
    }
    modint& operator/=(const modint& a) {
        return (*this) *= a.inv();
    }
    modint operator/(const modint& a) const {
        modint res(*this);
        return res/=a;
    }

    friend std::istream& operator>>(std::istream& is, modint& m) noexcept {
        is >> m.x;
        m.x %= mod;
        if (m.x < 0) m.x += mod;
        return is;
    }

    friend ostream& operator<<(ostream& os, const modint& m){
        os << m.x;
        return os;
    }
};

using mint = modint<MOD998244353>;

void solve(){
    ll n; cin >> n;
    vector<ll> a(n+1, 0);
    for(ll i=1; i<=n; i++) cin >> a[i];

    ll MAX = 1e5;
    vector<vector<mint>> dp(n+1, vector<mint>(MAX+1, 0));
    vector<vector<mint>> sum(n+1, vector<mint>(MAX+1, 0));

    //初期化
    dp[0][0] = 1;
    sum[0][0] = 1;
    for(ll j=1; j<=MAX; j++) sum[0][j]=1;

    //遷移
    for(ll i=1; i<=n; i++){
        for(ll j=a[i]; j<=MAX; j++){
            ll l = a[i-1], r = min(j-a[i]+a[i-1], j);
            if(r<0) continue;
            if(r < l) continue;
            if(MAX<r) r = MAX;
            if(l>0){
                dp[i][j] = sum[i-1][r]-sum[i-1][l-1];
            }else{
                dp[i][j] = sum[i-1][r];
            }
        }

        sum[i][0] = dp[i][0];
        for(ll j=1; j<=MAX; j++) sum[i][j]=sum[i][j-1]+dp[i][j];
    }

    mint ans = 0;
    for(ll j=0; j<=MAX; j++) ans += dp[n][j];
    cout << ans << '\n';
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    int T=1;
    //cin >> T;
    while(T--) solve();
}