#include "bits/stdc++.h"
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<class key, class cmp = std::less<key>>
using op_set = tree<key, null_type, cmp, rb_tree_tag, tree_order_statistics_node_update>;
#ifdef thunder
#include "bug.h"
#else
#define bug(...) 
#endif

#define ll long long
#define lld double
#define all(x) x.begin(), x.end()
#define iceil(n, x) (((n) + (x) - 1) / (x))

const ll INF=2e18;
const ll mod=998244353;
const ll maxn=1e5+5;

template< ll mod >
struct ModInt {
  ll x;
  ModInt() : x(0) {}
  ModInt(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}
  ModInt &operator+=(const ModInt &p) {
    if((x += p.x) >= mod) x -= mod;
    return *this;
  }
  ModInt &operator-=(const ModInt &p) {
    if((x += mod - p.x) >= mod) x -= mod;
    return *this;
  }
  ModInt &operator*=(const ModInt &p) {
    x = (int) (1LL * x * p.x % mod);
    return *this;
  }
  ModInt &operator/=(const ModInt &p) {
    *this *= p.inverse();
    return *this;
  }
  ModInt operator-() const { return ModInt(-x); }
  ModInt operator+(const ModInt &p) const { return ModInt(*this) += p; }
  ModInt operator-(const ModInt &p) const { return ModInt(*this) -= p; }
  ModInt operator*(const ModInt &p) const { return ModInt(*this) *= p; }
  ModInt operator/(const ModInt &p) const { return ModInt(*this) /= p; }
  bool operator<(const ModInt &p) const { return x < p.x; }
  bool operator>(const ModInt &p) const { return x > p.x; }
  bool operator==(const ModInt &p) const { return x == p.x; }
  bool operator!=(const ModInt &p) const { return x != p.x; }
  string to_str() { return to_string(x); }
  ModInt inverse() const {
    ll a = x, b = mod, u = 1, v = 0, t;
    while(b > 0) {
      t = a / b;
      swap(a -= t * b, b);
      swap(u -= t * v, v);
    }
    return ModInt(u);
  }
  ModInt pow(int64_t n) const {
    ModInt ret(1), mul(x);
    while(n > 0) {
      if(n & 1LL) ret *= mul;
      mul *= mul;
      n >>= 1LL;
    }
    return ret;
  }
  friend ostream &operator<<(ostream &os, const ModInt &p) {
    return os << p.x;
  }
  friend istream &operator>>(istream &is, ModInt &a) {
    int64_t t;
    is >> t;
    a = ModInt< mod >(t);
    return (is);
  }
  static ll get_mod() { return mod; }
};
using mint = ModInt< mod >;

template <typename node, typename update>
struct segTree{
    ll len;
    vector<node> t;
    vector<update> u;
    vector<bool> lazy;
    vector<ll> tl,tr;
    node identity_element;
    update identity_transformation;

    template<typename T>
    segTree(T &a){
        len = a.size();
        t.resize(4 * len);
        u.resize(4 * len);
        lazy.resize(4 * len);
        tl.resize(4 * len);
        tr.resize(4 * len);
        identity_element = node();
        identity_transformation = update();
        build(a,1,0,len-1);
    }

    template <typename T>
    void build(const T &a, const ll &v, const ll &l, const ll &r){
        tl[v]=l;
        tr[v]=r;
        if (l == r){
            t[v]=a[l];
            return;
        }
        ll tm = (l + r) >> 1;
        build(a, v << 1, l, tm);
        build(a, v << 1 | 1, tm + 1, r);
        t[v].merge(t[v << 1], t[v << 1 | 1]);
    }

    void apply(const ll &v, update val){
        if (tl[v] != tr[v]){
            lazy[v] = 1;
            u[v].combine(val, tl[v], tr[v]);
        }
        val.apply(t[v], tl[v], tr[v]);
    }

    void pushdown(const ll &v){
        if(lazy[v]){
            apply(v << 1, u[v]);
            apply(v << 1 | 1, u[v]);
            u[v] = identity_transformation;
            lazy[v] = 0;
        }
    }
 
    // rupd = range update
    void rupd(const ll &v,const ll &l, const ll &r, update val){
        if (l > tr[v] || r < tl[v])
            return;
        if (tl[v] >= l && tr[v] <= r){
            apply(v,val);
            return;
        }
        pushdown(v);
        rupd(v << 1, l, r, val);
        rupd(v << 1 | 1, l, r, val);
        t[v].merge(t[v << 1], t[v << 1 | 1]);
    }

    node query(const ll &v,const ll &l, const ll &r){
        if (l > tr[v] || r < tl[v])
            return identity_element;
        if (tl[v] >= l && tr[v] <= r)
            return t[v];
        pushdown(v);
        node a,b,ans;
        a=query(v*2,l,r);
        b=query(v*2+1,l,r);
        ans.merge(a,b);
        return ans;
    }
    node query(const ll &l, const ll &r){
        return query(1, l, r);
    }
    void rupd(const ll &l, const ll &r, update upd){
        rupd(1, l, r, upd);
    }
};

struct node1{
    ll sum=0;
    // use more variables if you want more information
    // these default values should be identity_element
    
    node1() {}
    node1(ll val){
        sum=val;
    }
    void merge(const node1 &l, const node1 &r){
        sum=l.sum+r.sum;
    }
}; 
struct update1{
    ll v=0;
    // use more variables if you want more information
    // these default values should be identity_transformation
    
    update1() {}
    update1(ll val){
        v=val;
    }
    // combine the current update1 with the other update1
    void combine(update1 &other, const ll &tl, const ll &tr){
        // only needed for range updates
    }
    // store the correct information in the node1 x
    void apply(node1 &x, const ll &tl, const ll &tr){
        x.sum=v;
    }
};

void solve(){
    ll n,k;
    cin>>n>>k;
    vector<ll> a(n+5);
    for(ll i=1;i<=n;i++)    cin>>a[i];
    vector<ll> pref(n+5,0);
    for(ll i=1;i<=n;i++){
        pref[i]=pref[i-1]+a[i];
    }
    map<ll,ll> mp;
    for(ll i=1;i<=n;i++){
        mp[pref[i]]++;
        mp[pref[i]-k]++;
    }
    ll cnt=1;
    for(auto &i:mp){
        i.second=cnt++;
    }
    vector<ll> mf(cnt+5);
    segTree<node1,update1> st(mf);
    vector<mint> dp(n+5,0); 
    dp[0]=1;
    for(ll i=1;i<=n;i++){
        // for(ll j=0;j<i;j++){
        //     if(pref[i]-pref[j]!=k){     // pref[j]!=pref[i]-k
        //         dp[i]+=dp[j];
        //     }
        // }
        dp[i]+=st.query(0,mp[pref[i]]-k-1).sum + st.query(mp[pref[i]]-k+1,cnt+2).sum;
        st.rupd(mp[pref[i]],mp[pref[i]],1);
    }
    cout<<dp[n]<<'\n';

}

signed main(){
    ios_base::sync_with_stdio(false), cin.tie(nullptr);
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    int t=1;
    // cin>>t;
    for(int i=1;i<=t;i++){
        solve();
    }
    return 0;
}