import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int n = Integer.parseInt(sa[0]);
		int m = Integer.parseInt(sa[1]);
		br.close();

		int mod = 998244353;
		int x = 31;
		long[] dp0 = new long[x];
		long[] dp1 = new long[x];
		dp0[x - 1] = 1;
		for (int i = x - 2; i >= 0; i--) {
			if ((m >> i & 1) == 1) {
				dp0[i] += dp0[i + 1] * n;
				dp1[i] += dp0[i + 1];
			} else {
				dp0[i] += dp0[i + 1];
			}
			dp1[i] += dp1[i + 1] * (n + 1);
			dp0[i] %= mod;
			dp1[i] %= mod;
		}
		long ans = dp0[0] + dp1[0];
		ans %= mod;
		System.out.println(ans);
	}
}