from sys import stdin, stdout
def foo(n):
    answer = 0
    yukiko = 0
    cursor = -1
    limit = n * 2 - 1
    lis = [None for i in range(limit + 1)]
    big_num = pow(10, 9) + 7
    def bar(yukiko, cursor, lis):
        nonlocal answer
        for i in [1,-1]:
            cursor += 1
            lis[cursor] = i
            yukiko += i
            if yukiko == n:
                answer += 1
                cursor -= 1
                yukiko -= i
            elif cursor-1 == n and yukiko <= 0:
                cursor -= 1
                yukiko -= i
            elif cursor == limit:
                cursor -= 1
                yukiko -= i
            else:
                yukiko, cursor, lis = bar(yukiko, cursor, lis)
        yukiko -= lis[cursor]
        cursor -= 1
        return yukiko, cursor, lis
    bar(yukiko, cursor, lis)
    return answer % big_num
if __name__ == '__main__':
    answer = foo(int(stdin.readline()))
    stdout.write(f'{answer}\n')