# -*- coding: utf-8 -*-

import math

def t(n):
    t = 1
    for k in xrange(1, n * 2 + 1):
        t *= k
        if( k % 2 == 0 ):
            t /= 2
        t %= 1000000007
    return t


def solve(n):
    return t(n)

if __name__ == "__main__":
    print solve(int(raw_input()))