#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
template <class T>
void chmin(T& a, const T& b) noexcept {
  if (b < a) a = b;
}
template <class T>
void chmax(T& a, const T& b) noexcept {
  if (a < b) a = b;
}
void debug_out() { cout << "\n"; }
template <class T, class... Args>
void debug_out(const T& x, const Args&... args) {
  cout << x << " ";
  debug_out(args...);
}
const int mod = 998244353;
struct mint {
  ll x;
  mint(ll x = 0) : x((x % mod + mod) % mod) {}
  mint operator-() const { return mint(-x); }
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod - a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator*=(const mint a) {
    (x *= a.x) %= mod;
    return *this;
  }
  mint operator+(const mint a) const { return mint(*this) += a; }
  mint operator-(const mint a) const { return mint(*this) -= a; }
  mint operator*(const mint a) const { return mint(*this) *= a; }
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t >> 1);
    a *= a;
    if (t & 1) a *= *this;
    return a;
  }
  mint inv() const { return pow(mod - 2); }
  mint& operator/=(const mint a) { return *this *= a.inv(); }
  mint operator/(const mint a) const { return mint(*this) /= a; }
  bool operator==(const mint rhs) const { return x == rhs.x; }
  bool operator!=(const mint rhs) const { return x != rhs.x; }
};
istream& operator>>(istream& is, mint& a) { return is >> a.x; }
ostream& operator<<(ostream& os, const mint& a) { return os << a.x; }
int main() {
  std::cin.tie(nullptr);
  std::ios_base::sync_with_stdio(false);
  std::cout << std::fixed << std::setprecision(15);
  int n, s;
  cin >> n >> s;
  vector<int> a(n);
  for (int i = 0; i < (n); ++i) cin >> a[i];
  vector<mint> F(s + 5, 0);
  mint ans = 0;
  for (int i = 0; i < (n); ++i) {
    for (int j = s; j - a[i] >= 0; --j) {
      F[j] += F[j - a[i]];
    }
    F[0] += 1;
    F[a[i]] += 1;
    ans += F[s];
  }
  cout << ans << endl;
  return 0;
}
