#include<stdio.h>
FILE *f1=fopen("fractii.in","r"), *f2=fopen("fractii.out","w");
int prime(int a,int b)
{
	while(a!=b)
	{
		if(a>=b)
			a-=b;
		else
			b-=a;
	}
	if(a==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;
}