#include<iostream>
using namespace std;
int main(){
    int N;
    long long ans;
    long long dp[100000][3];
    cin >> N;
    dp[0][0] = 0;
    dp[0][1] = 1;
    dp[0][2] = 0;
    for(int i=1;i<N;i++){
        dp[i][0] = (dp[i-1][1]+dp[i-1][2])%1000000007;
        dp[i][1] = dp[i-1][0];
        dp[i][2] = dp[i-1][1];
    }
    ans = dp[N-1][0]+dp[N-1][1]+dp[N-1][2];
    ans %= 1000000007;
    cout << ans << endl;
    return 0;
}