#include <iostream>
#include <fstream>

using namespace std;

ifstream fi("fractii.in");
ofstream fo("fractii.out");

bool ireductibil(int a,int b)
{
    int r;

    do{
        r=a%b;
        a=b;
        b=r;
    }while(r!=0);

    if(a==1)
        return true;
    return false;
}

int main()
{
    int N,i,j,k,a,p;

    fi>>N;
    k=0;

    for(i=1;i<=N;i++)
    {
        for(j=1;j<=N;j++)
            if(ireductibil(i,j))
                k++;
    }

    fo<<k;

    return 0;
}