#include <iostream>
#include <vector>
#include <cmath>

using namespace std;
#define MODULO 1'000'000'007L

long factorial(long input)
{
    long output = 1;
    for (long i = 2; i <= input; i++)
    {
        output = (output * i) % MODULO;
    }
    return output;
}

int main() {
    int n;
    cin >> n;
    long count = n;
    count = (n * factorial(4*n-4));
    count /= (factorial(2 * n - 4) * factorial(2 * n));
    cout << (count - 2 * n + 2) % MODULO << endl;
    return 0;
}