#include <bits/stdc++.h>
#define MOD 1000000007

using namespace std;

int N;

int main(void){
    
    cin >> N;
    
    int i;
    long long result = 1;
    for(i = 1; i <= N * 2; ++i){
        result *= i;
        if(i % 2 == 0) result /= 2;
        result %= MOD;
    }
    
    printf("%lld\n", result);
    
    return 0;
}