import java.io.*;
import java.util.*;

import static java.lang.Math.*;

public class Main {
    static public class pair {
        int u;
        int idx;
        int val;

        public pair(int x, int i) {
            u = x;
            idx = i;
            val = -1;
        }
    }

    static public class trp implements Comparable<trp> {

        int idx;
        int val;

        public trp(int v, int i) {
            idx = i;
            val = v;
        }

        @Override
        public int compareTo(trp trp) {
            return idx - trp.idx;
        }
    }

    static int[] color;
    static ArrayList<pair>[] adj;
    static int[] Arr, Arry;
    static int inf = (int) 1e9, n, s, h, x, y;
    static boolean[][] matrix;
    static long[][] memo;
    static long mod = 998244353;

    public static long dp(int idx, int rem) {
        if (idx == n||rem<0)
            return rem == 0 ? 1 : 0;
        if(memo[idx][rem]!=-1)return memo[idx][rem];
        long end = rem == 0 ? 1 : 0;
        long take = dp(idx + 1, rem - Arr[idx]);
        long leave = dp(idx + 1, rem);
        return memo[idx][rem]=(end % mod + take % mod + leave % mod) % mod;
    }

    public static boolean isBadrome(String str) {
        for (int i = 0; i <= str.length() / 2; i++)
            if (str.charAt(i) != str.charAt(str.length() - 1 - i))
                return false;
        return true;


    }

    public static void main(String[] args) throws Exception {
//        Scanner sc = new Scanner("kitchen.in");
//        PrintWriter pw = new PrintWriter("kitchen.out");
        Scanner sc = new Scanner(System.in);
        PrintWriter pw = new PrintWriter(System.out);
        n = sc.nextInt();
        s = sc.nextInt();
        Arr = new int[n];
        for (int i = 0; i < n; i++)
            Arr[i] = sc.nextInt();
        long ans = 0;
        memo=new long[n][s+1];
        for(long []x:memo)Arrays.fill(x, -1);
        for (int i = 0; i < n; i++){
            ans += dp(i, s);
          ans=ans%mod;
        }
        pw.println(ans);
        pw.close();
    }

    public static class Scanner {
        StringTokenizer st;
        BufferedReader br;

        public Scanner(InputStream s) {
            br = new BufferedReader(new InputStreamReader(s));
        }

        public Scanner(String s) throws FileNotFoundException {
            br = new BufferedReader(new FileReader(s));

        }

        public String next() throws IOException {
            while (st == null || !st.hasMoreTokens())
                st = new StringTokenizer(br.readLine());
            return st.nextToken();
        }

        public int nextInt() throws IOException {
            return Integer.parseInt(next());
        }

        public long nextLong() throws IOException {
            return Long.parseLong(next());
        }

        public String nextLine() throws IOException {
            return br.readLine();
        }

        public double nextDouble() throws IOException {
            String x = next();
            StringBuilder sb = new StringBuilder("0");
            double res = 0, f = 1;
            boolean dec = false, neg = false;
            int start = 0;
            if (x.charAt(0) == '-') {
                neg = true;
                start++;
            }
            for (int i = start; i < x.length(); i++)
                if (x.charAt(i) == '.') {
                    res = Long.parseLong(sb.toString());
                    sb = new StringBuilder("0");
                    dec = true;
                } else {
                    sb.append(x.charAt(i));
                    if (dec)
                        f *= 10;
                }
            res += Long.parseLong(sb.toString()) / f;
            return res * (neg ? -1 : 1);
        }

        public boolean ready() throws IOException, IOException {
            return br.ready();
        }

    }
}


Measured memory_bytes: 130516