#include<iostream>
using namespace std;
int cmmdc(int a, int b) {
	if (b == 0)
		return a;
	return cmmdc(b, a%b);
}
int main() {
	FILE *i, *o;
	int n, count = 0;
	i=fopen("fractii.in", "r");
	fscanf(i, "%d", &n);
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= n; j++)
			if (cmmdc(i, j) == 1) {
				count++;
			}
	o = fopen("fractii.out", "w");
	fprintf(o, "%d\n", count);
	fclose(i);
	fclose(o);
}