#include <stdio.h>
 int n,i,j,s;
 FILE *f,*g;

 int cmmdc(int a, int b)
{
if ((!a) || (!b)) return a+b;
if(a>b) return cmmdc(a%b,b);
return cmmdc(a,b%a);
}

int main()
{
f=fopen("fractii.in","r");
g=fopen("fractii.out","w");
fscanf(f,"%d",&n);
s=0;
for (i=1;i<=n;i++)
for (j=1;j<=n;j++)
if (cmmdc(i,j)==1) s++;
fprintf(g,"%d",s);
fclose(f);
fclose(g);
return 0;
}