#!/usr/bin/ python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import itertools
MOD = 10 ** 9 + 7

N = int(readline())


def gen_hook_nums():
    x = 1
    yield x
    i = 1
    while True:
        num = (2 * i + N - 1) * (2 * i + N - 2)
        den = i * (N + i)
        x = x * num * pow(den, MOD - 2, MOD) % MOD
        yield x
        i += 1


g = gen_hook_nums()
answer = sum(itertools.islice(g, N // 2 + 1)) % MOD
print(answer)