#include<iostream>
#include<fstream>
using namespace std;
int cmmdc(int a,int b)
{int c;
while (b) 
{
	c = a % b;
	a = b;
	b = c;
}
return a;

}
int main ()
{int i,n,c=0,j;
ifstream f("fractii.in");
ofstream g("fractii.out");
f>>n;
c=n;
for (i=2;i<=n;i++)
	for (j=1;j<=n;j++)
		 if (cmmdc(i,j)==1)
			 c++;
cout<<c;
g<<c;
f.close();
return 0;
}