#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
array<array<long long, 3>, 3> matmul(array<array<long long, 3>, 3> A, array<array<long long, 3>, 3> B){
  array<array<long long, 3>, 3> C;
  for (int i = 0; i < 3; i++){
    for (int j = 0; j < 3; j++){
      C[i][j] = 0;
    }
  }
  for (int i = 0; i < 3; i++){
    for (int j = 0; j < 3; j++){
      for (int k = 0; k < 3; k++){
        C[i][k] += A[i][j] * B[j][k];
        C[i][k] %= MOD;
      }
    }
  }
  return C;
}
array<array<long long, 3>, 3> matexp(array<array<long long, 3>, 3> A, long long N){
  array<array<long long, 3>, 3> ans;
  for (int i = 0; i < 3; i++){
    for (int j = 0; j < 3; j++){
      if (i == j){
        ans[i][j] = 1;
      } else {
        ans[i][j] = 0;
      }
    }
  }
  while (N > 0){
    if (N % 2 == 1){
      ans = matmul(ans, A);
    }
    A = matmul(A, A);
    N /= 2;
  }
  return ans;
}
int main(){
  long long N;
  cin >> N;
  array<array<long long, 3>, 3> A = {{{1, 0, 1}, {0, 1, 1}, {0, 1, 0}}};
  A = matexp(A, N - 1);
  cout << (A[0][1] + A[0][2]) % MOD << endl;
}