#include<bits/stdc++.h>
using namespace std;
#define MOD (int)((1e9)+7)
int n;
int memo[1000000][3];
int solve(int idx,int ken){
  if(idx == n-1) return 1;
  if(memo[idx][ken] != -1) return memo[idx][ken];
  int ret = 0;
  if(ken == 0){
    ret = solve(idx+1,ken+1) % MOD;
  }else if(ken == 1){
    ret = (solve(idx+1,ken+1) + solve(idx+1,0) ) % MOD;
  }else if(ken == 2){
    ret = solve(idx+1,0) % MOD;
  }
  return memo[idx][ken] = ret;
}

int main(){
  cin>>n;
  memset(memo,-1,sizeof(memo));
  cout<<solve(0,1)<<endl;
}