MOD = 998244353
D = 2

def mt(A, B):
    C = [[0] * D for _ in range(D)]
    for i in range(D):
        for j in range(D):
            tmp = 0
            for k in range(D):
                tmp += A[i][k] * B[k][j]
                tmp %= MOD
            C[i][j] = tmp
    return C

A = [[0, 1], [1, 1]]
X = [[1, 0], [0, 1]]
N = int(input())
N -= 1
while N > 0:
    if N & 1:
        X = mt(A, X)
    A = mt(A, A)
    N >>= 1

print((X[0][1] + X[1][1] - 1) % MOD)