import numpy as np


def mat_power(m: np.ndarray, n: int, mod: int) -> np.ndarray:
    if n == 0:
        return np.identity(len(m), dtype=m.dtype)

    res = mat_power(m, n // 2, mod)
    res = res @ res % mod
    if n % 2 == 1:
        res = res @ m % mod

    return res


MOD = 998244353
N = int(input())

m = np.array([[1, 1],
              [1, 0]])
res = mat_power(m, N-1, MOD) @ [[1], [0]]
res %= MOD

ans = (res[0][0] + res[1][0] - 1) % MOD
print(ans)