#include <iostream>
#include<fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int gcd(int a,int b)
{
    while(a!=b)
        if(a>b)
            a=a-b;
        else
            b=b-a;
    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;
}