#include<iostream.h>   
#include<fstream.h>   
ifstream(f);   
ofstream(g);   
int cmmdc(int a,int b)   
{while(0==0)   
{   
int r=a%b;   
if (r==0) break;   
a=b;   
b=r;   
}   
return b;   
}   
int main()   
{   
f.open("fractii.in");   
g.open("fractii.out");   
long int n;   
long long int s;
f>>n;
s=2*n-1;
for(int i=2;i<=n;i++)
{for(int j=2;j<=n;j++)
{
if (i!=j&&(i%j!=0||j%i!=0))
	if(cmmdc(i,j)==1) s++;}
}
g<<s;
f.close();
g.close();
return 0;   
}