#include "bits/stdc++.h"
using namespace std;
#define int long long
#define FOR(i, a, b) for(int i=(a);i<(b);i++)
#define RFOR(i, a, b) for(int i=(b-1);i>=(a);i--)
#define REP(i, n) for(int i=0; i<(n); i++)
#define RREP(i, n) for(int i=(n-1); i>=0; i--)
#define REP1(i, n) for(int i=1; i<=(n); i++)
#define RREP1(i, n) for(int i=(n); i>=1; i--)
#define ALL(a) (a).begin(),(a).end()
#define UNIQUE_SORT(l) sort(ALL(l)); l.erase(unique(ALL(l)), l.end());
#define CONTAIN(a, b) find(ALL(a), (b)) != (a).end()
#define out(...) printf(__VA_ARGS__)

int dxy[] = {0, 1, 0, -1, 0};

void solve();
signed main()
{
#if DEBUG
    std::ifstream in("input.txt");
    std::cin.rdbuf(in.rdbuf());
#endif
    cin.tie(0);
    ios::sync_with_stdio(false);
    solve();
    return 0;
}

/*================================*/
#if DEBUG
#define SIZE 200
#else
#define SIZE 1234560
#endif

int N,M,Q;
int MOD=1e9+7;
int DP[SIZE][2][2]; // i番目/2つ前/1つ前
int KEN=0, PA=1;

void solve() {
    cin>>N;
    if (N==1) {
        cout << 1 << endl;
        return;
    }
    if (N==2) {
        cout << 2 << endl;
        return;
    }
    DP[1][KEN][KEN] = 1;
    DP[1][KEN][PA] = 1;
    FOR(i,1,N-1)REP(j,2)REP(k,2) {
        if (!(j==KEN&&k==KEN)) (DP[i+1][k][KEN] += DP[i][j][k])%=MOD;
        if (k==KEN) (DP[i+1][k][PA] += DP[i][j][k])%=MOD;
    }
    int ans = 0;
    REP(j,2)REP(k,2) {
        (ans += DP[N-1][j][k])%=MOD;
    }
    cout << ans << endl;
}