#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1000000007;
int main(){
  int N;
  cin >> N;
  vector<vector<long long>> dp(N + 1, vector<long long>(N + 1, 0));
  dp[0][0] = 1;
  for (int i = 0; i < N; i++){
    for (int j = 0; j <= N; j++){
      dp[i + 1][j] = dp[i][j];
      if (j >= i && i >= 3){
        dp[i + 1][j] += dp[i + 1][j - i];
        dp[i + 1][j] %= MOD;
      }
    }
  }
  cout << (dp[N][N] + 1) % MOD << endl;
}