#include <iostream>
#include <fstream>
using namespace std;

long cmmdc(int a,int b) {
	 if(a%b==0) return b;
	 else return cmmdc(b,a%b);
}

int main() {
	long n,i,j;
	int t=0;
	ifstream f("fractii.in");
	f>>n;
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			if(cmmdc(i,j)==1)
				t++;
	ofstream g("fractii.out");
	g<<t;
	f.close();
	g.close();
	return 0;
}