#include <stdio.h>

int cmmdc( int a, int b) 
{
    while (a!=b) {
          if (a>b) a=a-b;
             else b=b-a;
    }
    return a;
}

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