#include <stdio.h>

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 ()
{
    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 (i==j) ;
               else if (cmmdc(i,j)==1) k++;
    k++;
    fprintf (g, "%d", k);
    return 0;
}