#include<bits/stdc++.h>
using namespace std;
#define int long long
#define vi vector<int>
#define pb push_back
#define P pair<int,int>
#define PP pair<P,int>
#define fi first
#define se second
#define INF 1e9
#define MOD 1000000007
#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
int dp[1000001][2][2];
signed main(){
    int n;
    cin>>n;
    if(n==1){
        cout<<1<<endl;
        return 0;
    }
    dp[2][0][0]=1;
    dp[2][1][0]=1;
    FOR(i,2,n){
        dp[i+1][0][0]=dp[i][0][1];
        dp[i+1][1][1]=0;
        dp[i+1][1][0]=dp[i][0][0]+dp[i][0][1];
        dp[i+1][0][1]=dp[i][1][0];

        REP(j,2){
            REP(k,2){
                dp[i+1][j][k]%=MOD;
            }
        }
    }
    int ans=0;
    REP(i,2){
        REP(j,2){
            (ans+=dp[n][i][j])%=MOD;
        }
    }
    cout<<ans<<endl;
    return 0;
}