import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N = int(input())
	ans = 1
	for i in range(1, 2 * N + 1):
		ans *= i
		ans %= con

	inv2 = pow(2, con - 2, con)
	inv = pow(inv2, N, con)

	ans *= inv
	ans %= con
	print(ans)

if __name__ == '__main__':
	main()