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--)
        {
            r = r * i % 1000000007;
        }
        Console.WriteLine(r);
    }
}