#include<stdio.h>



int main() {
	FILE *fin = fopen("fractii.in", "r");
	FILE *fout = fopen("fractii.out", "w");
	int n, i, j, count, div;
	fscanf(fin, "%d", &n);
	count = div = 0;
	for(i = 1; i <= n; i++) {
		for (j = 1; j <= n; j++) {
				count++;
				if ((i % j == 0) && (j % i == 0))
					div++;
	}
}
	if ( n % 2 == 0)
		printf("%d", count - div - 1);
	else 
		printf("%d", count - div + 1);
}