include[HTML_REMOVED]

int main(void)
{  
  /*********Begin*********/
  int n,a,b,c,d;
  b=1;
  scanf("%d",&n);
  if(n<0)
  printf("0");
  else if(n==0)
  printf("1");
  else
  {
      c=n;
  while(n>0)
  {
    a=n*b;
    n--;
    b=a;
  }
  d=b;
  while(c>0)
  {
  a=d*(b/c);
  b=b/c;
  c--;
  d=a;
  }
    printf("%d",d);
  }
  /*********End**********/ 
   return 0;