#include<fstream>
#include<math>
int n,s;
ifstream f("fractii.in");
ofstream g("fractii.out");
long prim(long a,long b)
{while(a!=b)
	if(a>b) a-=b;
	else b-=a;
 if(a==1) return 1;
 else return 0;
} 
int main()
{//long p;
 f>>n;
 s=2*n-1;
 for (long i=2;i<n;i++)
	for(long j=i+1;j<=n;j++)
		if (prim(i,j)) s+=2;
 g<<s;
 g.close();
 return 0;
}