def inv(x):
    return pow(x, MOD-2, MOD)

N = int(input())
MOD = 10 ** 9 + 7

fact = [1]

for i in range(1, 2*N+1):
    fact.append(fact[-1] * i % MOD)

ans = fact[2*N] * inv(pow(2, N, MOD))
ans %= MOD

print(ans)