#include <stdio.h>
#include <math.h>

long n;

long gcd(long a, long b) {
	long c = 0;
	while (b != 0) {
		c = a % b;
		a = b;
		b = c;
	}
	return a;
}


int main() {
	freopen("fractii.in", "r", stdin);
	freopen("fractii.out", "w", stdout);
	scanf("%ld", &n);
	long i, j;
	long long sol = 0;
	for (i = 1; i <= n; ++i) {
		for (j = 1; j <= n; ++j) {
			if (gcd(i, j) == 1) ++sol;
		}
	}
	printf("%lld\n", sol);
	return 0;
}