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