#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> p32;
typedef pair<ll,ll> p64;
typedef pair<double,double> pdd;
typedef vector<ll> v64;
typedef vector<int> v32;
typedef vector<vector<int> > vv32;
typedef vector<vector<ll> > vv64;
typedef vector<vector<p64> > vvp64;
typedef vector<p64> vp64;
typedef vector<p32> vp32;
ll MOD = 998244353;
double eps = 1e-12;
#define forn(i,e) for(ll i = 0; i < e; i++)
#define forsn(i,s,e) for(ll i = s; i < e; i++)
#define rforn(i,s) for(ll i = s; i >= 0; i--)
#define rforsn(i,s,e) for(ll i = s; i >= e; i--)
#define ln "\n"
#define dbg(x) cout<<#x<<" = "<<x<<ln
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define INF 2e18
#define all(x) (x).begin(), (x).end()
#define sz(x) ((ll)(x).size())
int main()
{
//ifstream cin("in.txt");
int n;
cin >> n;
vector<int> dpFull(n + 1);
dpFull[1] = 1;
dpFull[2] = 2;
vector<int> dpMissUp(n + 1);
vector<int> dpMissDown(n + 1);
dpMissUp[2] = 1;
dpMissDown[2] = 1;
for(int i = 3; i <= n; i++){
//szimmetrikus ez a ketto
dpMissUp[i] = dpMissDown[i - 1] + dpFull[i - 2];
dpMissDown[i] = dpMissUp[i - 1] + dpFull[i - 2];
dpFull[i] = dpMissUp[i - 1] + dpMissDown[i - 1] + dpFull[i - 1] + dpFull[i - 2];
}
cout << dpFull[n];
}