#include<fstream.h>
long int n,nr;
void main()
{
	fstream f("fractii.in",ios::in);
	fstream g("fractii.out",ios::out);
	f>>n;
	for(long int i=1;i<=n;i++)
	{
		for(long int j=1;j<=n;j++)
		{
			if(i==1)
			{
				nr++;
				//cout<<i<<"/"<<j<<" ";
			}
			else 
				if(j==1)
				{
					nr++;
					//cout<<i<<"/"<<j<<" ";
				}
			    else
					if(i%j!=0&&j%i!=0)
					{
						nr++;
						//cout<<i<<"/"<<j<<" ";
					}
		}
	}
	g<<nr<<endl;
	f.close();
	g.close();
}