#include<iostream.h>
#include<fstream.h>
fstream in("fractii.in",ios::in), out("fractii.out",ios::out);
int cmmdc(long a,long b)
{ while (a!=b)
	if(a>b) a=a-b;
	else b=b-a;
return a;
}
main()
{
long n,i,j,y;
long long x=0;
in>>n;
x+=n;
for(i=2;i<=n;i++)
for(j=1;j<=n;j++)
	{y=cmmdc(i,j);
	if (y==1) x++;
	}
out<<x;
}