/*
task:necklace
lang:C++
*/
#include<iostream>
using namespace std;
int main ()
{
    double g,d;
    int n,b,c,f,h;
    cin>>n;
    f=1;
    for(b=2;b<=n;b++)f=f*b; 
    b=n-1;
    c=n-2;
    d=(c*10+b)/100;
    g=b+10*n+d;
    h=f/g;
    
    cout<<h;
    
    system("PAUSE");
    
    return 0;
}

