#include <iostream>
#include<fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int gcd(int a,int b)
{
    int r;
    while (b>0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;

}
int main()
{
    int n,i,j,nr=0;
    f>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(gcd(i,j)==1)
                nr++;
    g<<nr;
    return 0;
}