#include<fstream.h>
int main()
{ifstream f("fractii.in");
 ofstream g("fractii.out");
 long a,i,s,j,k,sw;
 f>>a;
 s=2*a-1;
 for(i=2;i<=a;i++)
	{for(j=2;j<=a;j++)
		{sw=1;
		for(k=2;k<=j;k++)
			if(j%k==0&&i%k==0)
				{sw=0;
				}
		if(sw)s++;}
	}
 g<<s;
 g.close();
return 0;}