#include<stdio.h>
#include<math.h>
FILE *f=fopen("12perm.in","r");
FILE *g=fopen("12perm.out","w");
long long n;

void cit()
{
fscanf(f,"%lld",&n);

long long s;
s=1;
 for(long long i=2;i<=n;i++)
  s*=i;

if(n>3)
fprintf(g,"%lld",s-2*(n-1)*(n-3)*(n-2));

else fprintf(g,"%lld",s);


}

int main()
{

cit();
fcloseall();

return 0;
}