N = int(input())

A = [[1,1],[1,0]]
P = 998244353

def seki(A,B):
    l = [[0] * 2 for _ in range(2)]
    for i in range(2):
        for j in range(2):
            for k in range(2):
                l[i][j] += A[i][k] * B[k][j]
                l[i][j] %= P
    return l
u = N - 1
e = [[1,0],[0,1]]
while u:
    if u & 1:
        e = seki(e,A)
    A = seki(A,A)
    u >>= 1
ans = e[0][0] + e[1][0] - 1
#print(A)
print(ans % P)