#include <iostream>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using namespace std;
using i64 = long long;
using u64 = unsigned long long;
using m32 = atcoder::static_modint<1000000007>;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

m32 dp[1001] = {};

int main(){
    int N; cin >> N;
    dp[0] = 1;
    for(int k=3; k<=N; k++) for(int i=k; i<=N; i++) dp[i] += dp[i-k];
    cout << dp[N].val() << endl;
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;