N = int(input())
P  =10 ** 9 + 7
C = 2 * N + 5
fact = [1] * C
fact_inv = [1] * C
for i in range(2,C):
    fact[i] = fact[i-1] * i % P
fact_inv[-1] = pow(fact[-1],P-2,P)
for i in range(C-2,1,-1):
    fact_inv[i] = fact_inv[i+1] * (i + 1) % P
ans = fact[2 * N] * fact_inv[N] % P * fact_inv[N+1] % P
print(ans)