#include<stdio.h>
FILE *f1=fopen("fractii.in","r"), *f2=fopen("fractii.out","w");
int prime(int a, int b) 
{
	int r;
	r=a%b;
	while(r!=0)
	{
		a=b;
		b=r;
		r=a%b;
	}
  if(b==1) return 1;
  else return 0;
}
int main()
{
	int n,i,j,a=0;
	fscanf(f1,"%d",&n);
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			if(prime(i,j))
				a++;
	fprintf(f2,"%d",a);
	//fclose(f1);
	//fclose(f2);
	return 0;
}