/*
    Nume:Temian
    Date:
    Problema:
*/
#include <iostream>
#include <fstream>
using namespace std;
int euclid(int a, int b)  
 {  
    int c;  
    while (b) {  
        c = a % b;  
        a = b;  
        b = c;  
    }  
    return a;
}
int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    unsigned long int q,i,n,c=0;
    cin>>n;
    fin.close();
    for(i=1;i<=n;i++)
    {
    				 for(q=1;q<=n;q++)
                        if(euclid(q,i)==1)c++;
    }
    cout<<c;
    fout.close();
    system ("pause");
    return 1;
}