#include<stdio.h>

int c,n,d,s,i;

FILE *f=fopen("fractii.in","r"),*g=fopen("fractii.out","w");

int main()
{
fscanf(f,"%d",&n);

for(i=1; i<=n; i++)
{c=0;
for(d=2; d<=i; d++)
  if(i%d==0)c++;
 s=s+c;
}
if(n==2)  fprintf(g,"%d",3);
else if(n%2==0)
fprintf(g,"%d",n*n-n-s);
else fprintf(g,"%d",n*n-n-s+1);
}