#include<fstream.h>
int cmmdc(int a, int b)
{
while(a!=b)
{
	if(a>b)a-=b;
	else b-=a;
}
return a;
}
int main ()
{
ifstream f("fractii.in");
ofstream g("fractii.out");
int nr,n,i,j;
f>>n;
nr=n;
for(i=2;i<=n;i++)
{if(i%2==0)
	{for(j=1;j<=n;j+=2)
	{
	if(cmmdc(i,j)==1){nr++;}	
	}
	}
	else
	{
	for(j=1;j<=n;j+=1)
	{
	if(cmmdc(i,j)==1){nr++;}	
	}
	}
}
g<<nr<<"\n";
return 0;
}