#include<iostream>
#include<fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
unsigned cmmdc(unsigned a, unsigned b)
{ while(a!=b)
if(a<b)b=b-a;
else a=a-b;
if(b==1) return 1;
return 0;
}
int main ()
{unsigned n,i,j,nr=0;
f>>n;
f.close();
for(i=1;i<=n;i++)
	for(j=1;j<=n;j++)
		if(cmmdc(i,j)==1)nr++;
	g<<nr;
g.close();
return 0;
}