#include<iostream>
#include<fstream>
using namespace std;
int cmmdc(int a,int b)
{
    if(a!=b)
        if(a>b)
            return cmmdc(a-b,b);
        else
            return cmmdc(a,b-a);
    return a;
}
int f(int x,int n)
{
    int s=0,i;
    for(i=1;i<=n;i++)
        if(cmmdc(i,x)==1)
            s+=1;
    return s;
}
int main ()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    int n,s=0,i;
    in>>n;
    for(i=1;i<=n;i++)
            s+=f(i,n);
    out<<s;
}