using System;

class G
{
	static void Main()
	{
		var n = int.Parse(Console.ReadLine());

		var ncr = new MInt[n + 1];
		ncr[0] = 1;
		for (int i = 0; i < n; i++)
			ncr[i + 1] = ncr[i] * (n - i) / (i + 1);

		MInt r = 0;
		for (int d = 0; d <= n; d += 2)
			r += 2 * ncr[d] * MInt.MPow(2, Math.Abs(2 * d - n));
		Console.WriteLine(r);
	}
}

struct MInt
{
	const long M = 998244353;
	public long V;
	public MInt(long v) { V = (v %= M) < 0 ? v + M : v; }
	public override string ToString() => $"{V}";
	public static implicit operator MInt(long v) => new MInt(v);

	public static MInt operator -(MInt x) => -x.V;
	public static MInt operator +(MInt x, MInt y) => x.V + y.V;
	public static MInt operator -(MInt x, MInt y) => x.V - y.V;
	public static MInt operator *(MInt x, MInt y) => x.V * y.V;
	public static MInt operator /(MInt x, MInt y) => x.V * y.Inv().V;

	public static long MPow(long b, long i)
	{
		long r = 1;
		for (; i != 0; b = b * b % M, i >>= 1) if ((i & 1) != 0) r = r * b % M;
		return r;
	}
	public MInt Pow(long i) => MPow(V, i);
	public MInt Inv() => MPow(V, M - 2);
}