from sys import stdin, stdout

def foo(n):

    answer = 0
    yukiko = 0
    cursor = -1
    max_cursor = n * 2 - 1
    lis = [None for i in range(n * 2)]
    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) or (cursor == max_cursor):
                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')