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


def solve2(n):
    ans = 1

    for k in xrange(1, n + 1):
        ans *= k * ( 2 * k - 1)
        ans %= 1000000007

    return ans


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

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