class Combination:
    """
    SIZEが10^6程度以下の二項係数を何回も呼び出したいときに使う
    使い方:
    comb = Combination(SIZE, MOD)
    comb(10, 3) => 120
    """

    def __init__(self, N, MOD=10 ** 9 + 7):
        self.MOD = MOD
        self.fact, self.inv = self.__make_factorial_list(N)

    def __call__(self, n, k):
        if k < 0 or k > n:
            return 0
        res = self.fact[n] * self.inv[k] % self.MOD
        res = res * self.inv[n - k] % self.MOD
        return res

    def nPk(self, n, k):
        if k < 0 or k > n:
            return 0
        return self.fact[n] * self.inv[n - k] % self.MOD

    def __make_factorial_list(self, N):
        fact = [1] * (N + 1)  # 0!, 1!, 2!, 3!, 4!, ...
        inv = [1] * (N + 1)  # 1/0!, 1/1!, 1/2!, 1/3!, 1/4!, 1/5!
        MOD = self.MOD
        for i in range(1, N + 1):
            fact[i] = (fact[i - 1] * i) % MOD
        inv[N] = pow(fact[N], MOD - 2, MOD)
        for i in range(N, 0, -1):
            inv[i - 1] = (inv[i] * i) % MOD
        return fact, inv


n = int(input())
mod = 998244353
comb = Combination(n + 100, mod)

ans = 0
for k in range(0, n + 1, 2):
    ans += 2 * comb(n, k) * pow(2, abs(n - 2 * k), mod) % mod
    ans %= mod

print(ans)