#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 main ()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    int n,s=0,i,j;
    in>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(cmmdc(j,i)==1)
                s+=1;
    out<<s;
}