using System;
using System.Collections.Generic;

class P
{
    static void Main(string[] _)
    {
        UInt64 n = UInt64.Parse(Console.ReadLine());
        UInt64 r = 1;
        for (UInt64 i = n % 1000000007; i >= 1; i--)
        {
            if (i == 0)
            {
                r = 0;
                break;
            }
            r = r * i;
            if (1000000007 <= r)
            {
                r = r % 1000000007;
            }
        }
        Console.WriteLine(r);
    }
}