#include <stdio.h>

int main(void)
{
	FILE *f, *ret;
	int i, j, c = 0, n;
	
	f = fopen("fractii.in", "r");
	fscanf(f, "%d", &n);
	fclose(f);
	
	for(i = 1; i <= n; i++) { /* Numarator */
		for(j = 1; j <= n; j++) { /* Numitor */
			if(i == 1 || j == 1)
				c++;
			else if(i >= j && i % j != 0)
				c++;
			else if(i < j && j % i != 0)
				c++;
		}
	}
	
	ret = fopen("fractii.out", "w");
	fprintf(ret, "%d", c-1);
	fclose(ret);
	return 0;
}