#include <stdio.h>
//int a[1000000];

int calculare(long n){
	int nr=0,i,j;

	for (i=2;i<=n;i++)
		for (j=2;j<=n;j++)
			if ((i+j)%i!=0 && (i+j)%j!=0)
				nr++;
	
	return nr+2*n-1;
}

int main()
{
	FILE* f=fopen("fractii.in","r");
	FILE* g=fopen("fractii.out", "w");
	long n;

	fscanf(f,"%d", &n);
	fprintf(g,"%d",calculare(n));

	fclose(f);
	fclose(g);
	return 0;
}