#include<iostream.h>
#include<fstream.h>
int main ()
{long s=0;
	int n,p=1,i;
 ifstream f("fractii.in");
 ofstream g("fractii.out");
	
 f>>n;

 while(p<=n)
	{for(i=1;i<=n;i++)
		if(p%2==0 && i%2==0)
		{;}
			else
				if(p%i!=0 && i%p!=0)
		           s++;
  p++;
  cout<<endl;
}	
	g<<s+2*n-1;
}