#include<fstream.h>
int cmmdc(int a,int b)
{
	int r;
	while(b!=0)
	{
		r=a%b;
		a=b;
		b=r;
	}
	return a;
}
int main()
{
	ifstream fin("fractii.in");
	ofstream fout("fractii.out");
	int i,j,n,s;
	fin>>n;
	s=n;
	for(i=1;i<=n;i++)
		for(j=2;j<=n;j++)
			if(cmmdc(i,j)==1)
				s++;
	fout<<s;
	fin.close();
	fout.close();
	return 0;
}