using System;
using System.Collections.Generic;
using System.Linq;

class Solution
{
    static Dictionary<int, long> dict = new Dictionary<int, long>() { { 1, 1 }, { 2, 1 }, { 3, 2 } };

    static long F(int n)
    {
        if (dict.ContainsKey(n))
        {
            return dict[n];
        }

        long v = F(n - 2) + F(n - 1) * (n - 1);
        v %= 1000000000 + 7;

        dict[n] = v;
        return v;
    }

    static long F2(int n)
    {
        return (F(n) * n) % (1000000000 + 7);
    }
    static void Main()
    {
        var n = int.Parse(Console.ReadLine());
        Console.WriteLine(F2(n));
    }
}