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

public class Main {
    static final int MOD = 998244353;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        ArrayList<HashMap<Integer, Integer>> result = new ArrayList<>();
        result.add(new HashMap<>());
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            boolean settable = false;
            for (int j = result.size() - 1; j >= 0; j--) {
                if (result.get(j).containsKey(x - 1)) {
                    if (j == result.size() - 1) {
                        result.add(new HashMap<>());
                    }
                    result.get(j + 1).put(x, (result.get(j + 1).getOrDefault(x, 0) + result.get(j).get(x - 1)) % MOD);
                    settable = true;
                    break;
                }
            }
            if (!settable) {
                result.get(0).put(x, (result.get(0).getOrDefault(x, 0) + 1) % MOD);
            }
        }
        long ans = 0;
        for (int i = 1; i < result.size(); i++) {
            for (int x : result.get(i).values()) {
                ans += (long)i * x % MOD;
                ans %= MOD;
            }
        }
        System.out.println(ans);
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}