#include <stdio.h>
#include <stdlib.h>

int ciur(long x, long y)
{
	int k[1000001];
	long i,j;
	memset(k,0,1000001);
	if(x%2==0)
	{
		for(i=2;i<=x;i+=2) k[i]=1;
	}
	for(j=3;j<=x;j+=2)
		{
			if(k[i]) continue;
			if(x%j==0)
			{
				for(i=j;i<=x;i+=j) k[i]=1;
			}
		}
	for(i=2;i<=x;i++)
		if(k[i])
		{
			if(y%i==0) return 1;
		}
	return 0;
}

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,"%ld",&n);
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			{
				if(ciur(i,j)) continue;
				k++;
			}
	fprintf(g,"%ld\n",k);
	fclose(f);
	fclose(g);
	return 0;
}