import java.math.*;

public class E {

	public Object solve () {
		int N = sc.nextInt(), S = sc.nextInt(), R = sc.nextInt();

		C = modBin(S+N, N);
		long [] V = modInvs(N);
		
		long P = 0;
		for (int b : req(R, S))
			if (b * N >= S)
				for (int j : req(1, N))
					if (j*b <= S) {
						long L = mod(C[N-1][j-1] * F(b, N-j, S - j*b));
						P = mod(P + L * V[j]);
					}

		long Q = F(S+1, N, S-R);
		long res = mod(P * modInv(Q));
		return exit(res);
	}

	long [][] C;

	long F(int B, int K, int X) {
		if (K == 0)
			return X == 0 ? 1 : 0;
		long res = 0;
		for (int j : req(K))
			if (j*B <= X) {
				long S = - (2 * (j % 2) - 1);
				res = mod(res + S * C[K][j] * C[X - j*B + K-1][K-1]);
			}
		return res;
	}

	private static final boolean ONE_TEST_CASE = true;

	private static void init () {
	}

	private static final int MOD = 998244353;
	private static long mod (long x) { return mod(x, MOD); }
	private static long mod (long x, long mod) { return ((x % mod) + mod) % mod; }
	private static long [][] modBin (int N, int K) {
		long [][] res = new long [N+1][K+1];
		for (int n = 0; n <= N; ++n) {
			res[n][0] = 1;
			for (int k = 1; k <= K && k <= n; ++k)
				res[n][k] = mod(res[n-1][k] + res[n-1][k-1]);
		}
		return res;
	}
	private static long modInv (long x) { return modInv(x, MOD); }
	private static long modInv (long x, int mod) { return BigInteger.valueOf(x).modInverse(BigInteger.valueOf(mod)).longValue(); }
	private static long [] modInvs (int N) {
		long [] res = new long [N+1];
		for (int i = 1; i <= N; ++i)
			res[i] = modInv(i);
		return res;
	}
	private static int [] rep (int S, int T) { if (S >= T) return new int [0]; int [] res = new int [T-S]; for (int i = S; i < T; ++i) res[i-S] = i; return res; }
	private static int [] req (int N) { return req(0, N); }
	private static int [] req (int S, int T) { return rep(S, T+1); }
	//////////////////////////////////////////////////////////////////////////////////// OFF
	private static IOUtils.MyScanner sc = new IOUtils.MyScanner();
	private static Object print (Object o, Object ... A) { IOUtils.print(o, A); return null; }
	private static Object exit (Object o, Object ... A) { print(o, A); IOUtils.exit(); return null; }
	private static class IOUtils {
		public static class MyScanner {
			public String next () { newLine(); return line[index++]; }
			public int nextInt () { return Integer.parseInt(next()); }
			//////////////////////////////////////////////
			private boolean eol () { return index == line.length; }
			private String readLine () {
				try {
					return r.readLine();
				} catch (Exception e) {
					throw new Error (e);
				}
			}
			private final java.io.BufferedReader r;
			private MyScanner () { this(new java.io.BufferedReader(new java.io.InputStreamReader(System.in))); }
			private MyScanner (java.io.BufferedReader r) {
				try {
					this.r = r;
					while (!r.ready())
						Thread.sleep(1);
					start();
				} catch (Exception e) {
					throw new Error(e);
				}
			}
			private String [] line;
			private int index;
			private void newLine () {
				if (line == null || eol()) {
					line = split(readLine());
					index = 0;
				}
			}
			private String [] split (String s) { return s.length() > 0 ? s.split(" ") : new String [0]; }
		}
		private static String build (Object o, Object ... A) { return buildDelim(" ", o, A); }
		private static String buildDelim (String delim, Object o, Object ... A) {
			StringBuilder b = new StringBuilder();
			append(b, o, delim);
			for (Object p : A)
				append(b, p, delim);
			return b.substring(delim.length());
		}
		//////////////////////////////////////////////////////////////////////////////////
		private static final java.text.DecimalFormat formatter = new java.text.DecimalFormat("#.#########");
		private static void start () { if (t == 0) t = millis(); }
		private static void append (java.util.function.Consumer<Object> f, java.util.function.Consumer<Object> g, final Object o) {
			if (o.getClass().isArray()) {
				int len = java.lang.reflect.Array.getLength(o);
				for (int i = 0; i < len; ++i)
					f.accept(java.lang.reflect.Array.get(o, i));
			}
			else if (o instanceof Iterable<?>)
				((Iterable<?>)o).forEach(f::accept);
			else
				g.accept(o instanceof Double ? formatter.format(o) : o);
		}
		private static void append (final StringBuilder b, Object o, final String delim) {
			append(x -> { append(b, x, delim); }, x -> b.append(delim).append(x), o);
		}
		private static java.io.PrintWriter pw = new java.io.PrintWriter(System.out);
		private static void print (Object o, Object ... A) {
			pw.println(build(o, A));
			if (DEBUG)
				pw.flush();
		}
		private static void err (Object o, Object ... A) { System.err.println(build(o, A)); }
		private static boolean DEBUG;
		private static void write (Object o) {
			err(o, '(', time(), ')');
			if (!DEBUG)
				pw.println(o);
		}
		private static void exit () {
			IOUtils.pw.close();
			System.out.flush();
			err("------------------");
			err(time());
			System.exit(0);
		}
		private static long t;
		private static long millis () { return System.currentTimeMillis(); }
		private static String time () { return "Time: " + (millis() - t) / 1000.0; }
		private static void run (int N) {
			try { DEBUG = System.getProperties().containsKey("DEBUG"); }
			catch (Throwable t) {}

			for (int n = 1; n <= N; ++n) {
				Object res = new E().solve();
				if (res != null)
					write("Case #" + n + ": " + build(res));
			}
			exit();
		}
	}
	////////////////////////////////////////////////////////////////////////////////////
	public static void main (String[] args) {
		init();
		int N = ONE_TEST_CASE ? 1 : sc.nextInt();
		IOUtils.run(N);
	}
}
