#include <iostream>
#include <vector>
using ll = long long;
constexpr ll MOD = 1000000007;
#define show(x) std::cerr << #x << " = " << (x) << std::endl
template <typename T, typename A>
std::ostream& operator<<(std::ostream& os, const std::vector<T, A>& v)
{
    os << "[";
    for (const auto& p : v) { os << p << ","; }
    return (os << "]\n");
}
int main()
{
    int N;
    std::cin >> N;
    std::vector<std::vector<ll>> dp(N + 1, std::vector<ll>(N + 1, 0));
    std::vector<std::vector<ll>> sum(N + 1, std::vector<ll>(N + 1, 0));
    dp[0][0] = 1, std::fill(sum[0].begin(), sum[0].end(), 1);
    for (int i = 1; i <= N; i++) {
        for (int j = 1; j <= N; j++) {
            (dp[i][j] += sum[i - 1][j]) %= MOD;
            if (i + j >= N) { (dp[i][j] += MOD + sum[i - N + j][N] - sum[i - N + j][j]) %= MOD; }
            sum[i][j] = (sum[i][j - 1] + dp[i][j]) % MOD;
        }
    }
    //show(dp), show(sum);
    std::cout << sum[N][N] << std::endl;
    return 0;
}