#include <stdio.h>

int main(void)
{
	long i,j,n,k;
	FILE *f,*g;
	f=fopen("fractii.in","r");
	g=fopen("fractii.out","w");
	k=0;
	fscanf(f,"%l",&n);
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			{
				if(i%j==0 || j%i==0) continue;
				k++;
			}
	fprintf(g,"%l",k);
	fclose(f);
	fclose(g);
	return 0;
}