#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll=long long;
using Graph=vector<vector<pair<int,char>>>;
#define MAX 1000
#define MOD 1000000007
//#define MOD 998244353
//#define INF 1000000000
#define INF 1000000000000000000

int main(){
  int N;
  cin>>N;
  if(N==1||N==2){
    cout<<0<<'\n';
  }else{
    vector<ll> dp(N+1,0);
    dp[0]=1;
    for(int d=3;d<=N;d++){
      for(int i=0;i+d<=N;i++){
        dp[i+d]+=dp[i];
        dp[i+d]%=MOD;
      }
    }
    cout<<dp[N]<<'\n';
  }
}