// Slower C++ solution:
#include <bits/stdc++.h>



using namespace std;



#define all(x) begin(x), end(x)



using ll = long long;

using ld = long double;

using pii = pair<int, int>;

using vi = vector<int>;



struct modint {

    static const int MOD = 998244353;



    int v;

    modint(const int _v = 0): v(_v % MOD) {

        if (v < 0) v += MOD;

    }



    bool operator==(const modint& other) const {

        return v == other.v;

    }



    modint& operator+=(const modint& other) {

        v += other.v;

        if (v >= MOD)

            v -= MOD;

        return *this;

    }



    modint& operator-=(const modint& other) {

        v -= other.v;

        if (v < 0)

            v += MOD;

        return *this;

    }



    modint& operator*=(const modint& other) {

        v = 1LL * v * other.v % MOD;

        return *this;

    }



    modint& operator/=(const modint& other) {

        *this *= other.inv();

        return *this;

    }



    modint operator+(const modint& other) const {

        return modint(v) += other;

    }



    modint operator-(const modint& other) const {

        return modint(v) -= other;

    }



    modint operator*(const modint& other) const {

        return modint(v) *= other;

    }



    modint operator/(const modint& other) const {

        return modint(v) /= other;

    }



    static modint pow(modint b, ll e) {

        modint res = 1;

        for (ll p = 1; p <= e; p <<= 1) {

            if (p & e)

                res *= b;

            b *= b;

        }



        return res;

    }



    modint pow(ll e) const {

        return pow(*this, e);

    }



    modint inv() const {

        return pow(MOD - 2);

    }



    friend ostream& operator<<(ostream& os, modint m) {

        return os << m.v;

    }

};



constexpr int MAXN = 1e5;

modint fact[MAXN], tcaf[MAXN];



void gen_fact() {

    fact[0] = 1;

    for (int i = 1; i < MAXN; ++i) {

        fact[i] = fact[i - 1] * i;

    }



    tcaf[MAXN - 1] = modint(1) / fact[MAXN - 1];

    for (int i = MAXN - 2; i >= 0; --i) {

        tcaf[i] = tcaf[i + 1] * (i + 1);

    }

}



modint choose(int n, int k) {

    assert(n >= 0);

    if (k < 0 or n < k)

        return 0;



    return fact[n] * tcaf[k] * tcaf[n - k];

}



int main() {

    ios_base::sync_with_stdio(false);

    cin.tie(0); cout.tie(0);



    int n;

    cin >> n;



    modint ans = modint::pow(3, n);

    modint cur = 0;

    modint term = 1;

    modint p = 2;

    // n choose k * 2^k for k in range()

    for (int k = n; k > n / 2; --k) {

        cur += term * p;

        // going from n!/k!(n-k)! to n!/(k-1)!(n-k+1)!

        // multiply by k/(n-k+1)

        term /= (n - k + 1);

        term *= k;

        p += p;

    }



    cout << ans - cur << '\n';

 

    return 0;

}


// Faster C++ solution for the same problem (measured speedup: 1.6648754074594652x):
#include <bits/stdc++.h>



using namespace std;



#define all(x) begin(x), end(x)



using ll = long long;

using ld = long double;

using pii = pair<int, int>;

using vi = vector<int>;



struct modint {

    static const int MOD = 998244353;



    ll v;

    modint(const int _v = 0): v(_v % MOD) {

        if (v < 0) v += MOD;

    }



    bool operator==(const modint& other) const {

        return v == other.v;

    }



    modint& operator+=(const modint& other) {

        v += other.v;

        if (v >= MOD)

            v -= MOD;

        return *this;

    }



    modint& operator-=(const modint& other) {

        v -= other.v;

        if (v < 0)

            v += MOD;

        return *this;

    }



    modint& operator*=(const modint& other) {

        v = 1LL * v * other.v % MOD;

        return *this;

    }



    modint& operator/=(const modint& other) {

        *this *= other.inv();

        return *this;

    }



    modint operator+(const modint& other) const {

        return modint(v) += other;

    }



    modint operator-(const modint& other) const {

        return modint(v) -= other;

    }



    modint operator*(const modint& other) const {

        return modint(v) *= other;

    }



    modint operator/(const modint& other) const {

        return modint(v) /= other;

    }



    static modint pow(modint b, ll e) {

        modint res = 1;

        for (ll p = 1; p <= e; p <<= 1) {

            if (p & e)

                res *= b;

            b *= b;

        }



        return res;

    }



    modint pow(ll e) const {

        return pow(*this, e);

    }



    modint inv() const {

        return pow(MOD - 2);

    }



    friend ostream& operator<<(ostream& os, modint m) {

        return os << m.v;

    }

};



int main() {

    ios_base::sync_with_stdio(false);

    cin.tie(0); cout.tie(0);



    int n;

    cin >> n;



    modint ans = modint::pow(3, n);

    modint cur = 0;

    modint term = 1;

    modint p = 2;

    // n choose k * 2^k for k in range()

    for (int k = n; k > n / 2; --k) {

        cur += term * p;

        // going from n!/k!(n-k)! to n!/(k-1)!(n-k+1)!

        // multiply by k/(n-k+1)

        term /= (n - k + 1);

        term *= k;

        p += p;

    }



    cout << ans - cur << '\n';

 

    return 0;

}