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();
        int m = sc.nextInt();
        StringBuilder tmp = new StringBuilder();
        while (m > 0) {
            tmp.append(m % 2);
            m >>= 1;
        }
        char[] values = new String(tmp.reverse()).toCharArray();
        int length = values.length;
        int[][] dp = new int[length + 1][length + 1];
        int count = 0;
        for (int i = 1; i <= length; i++) {
            for (int j = 0; j < length; j++) {
                dp[i][j + 1] += dp[i - 1][j];
                dp[i][j + 1] %= MOD;
                dp[i][j] += dp[i - 1][j];
                dp[i][j] %= MOD;
            }
            if (values[i - 1] == '1') {
                dp[i][count]++;
                dp[i][count] %= MOD;
                count++;
            }
        }
        dp[length][count]++;
        long ans = 0;
        for (int i = 0; i <= length; i++) {
            ans += pow(n, i) * dp[length][i] % MOD;
            ans %= MOD;
        }
        System.out.println(ans);
    }
    
    static long pow(long x, int p) {
        if (p == 0) {
            return 1;
        } else if (p % 2 == 0) {
            return pow(x * x % MOD, p / 2);
        } else {
            return pow(x, p - 1) * x % MOD;
        }
    }
}

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();
    }
    
}