import sys
#input = sys.stdin.readline
#input = sys.stdin.buffer.readline #文字列はダメ
sys.setrecursionlimit(1000000)
import math
import bisect
#import itertools
#import random
#from heapq import heapify, heappop, heappush
from collections import defaultdict
from collections import deque
#import copy #DeepCopy: hoge = [_[:] for _ in hogehoge]
#from functools import lru_cache
#@lru_cache(maxsize=None)
#MOD = pow(10,9) + 7
MOD = 998244353
#dx = [1,0,-1,0]
#dy = [0,1,0,-1]
#dx8 = [1,1,0,-1,-1,-1,0,1]
#dy8 = [0,1,1,1,0,-1,-1,-1]

def mat_dot(A, B, MOD):
  #A:n*m行列, B:m*l行列
  n, m, l = len(A), len(A[0]), len(B[0])
  X = [[0]*l for i in range(n)]
  for i in range(n):
    for j in range(l):
      temp = 0
      for k in range(m):
        temp = (temp + A[i][k] * B[k][j]) % MOD
      X[i][j] = temp
  return X
 
def mat_pow(A, x, MOD):
  #A^x
  n = len(A)
  X = [[0] * n for i in range(n)]
  for i in range(n):
    X[i][i] = 1
  for i in range(x.bit_length()):
    if (x>>i)&1:
      X = mat_dot(X, A, MOD)
    A = mat_dot(A, A, MOD)
  return X

def main():
    N = int(input())
    s = [[1,0]]
    P = [[1,1],[1,0]]
    X = mat_dot(s,mat_pow(P,N,MOD),MOD)
    # print(X)
    ans = X[0][0] - 1
    print(ans%MOD)

if __name__ == '__main__':
    main()