#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
unsigned int nr,Q,P,N,a,b;
int main()
{f>>N;
nr=(2*N)-1;
for(P=2;P<=N;P++)
	for(Q=2;Q<=N;Q++)
		{a=P;b=Q;
		while(a!=b)
			if(a>b)
				a=a-b;
			else
				b=b-a;
		if(a==0||a==1)
				nr++;}
g<<nr<<'\n';
g.close();
f.close();}