#include<fstream>
using namespace std;

int main() {
	int n;
	ofstream out("fractii.out");
	ifstream in("fractii.in");
	in >> n;
	int s = n;
	for(int a = 2; a < n; a++) {
		for(int b = 2; b < n; b++) {
		if(a%b != 0) {
			s+= 1;
		}
		}
	}
	for(int c = 2; c < n; c++) {
		for(int d = 2; d < n; d++) {
		if(d%c != 0) {
			s+= 1;
		}
	}
	out << s;

	return 0;
}