#include <iostream>
#include<fstream>

using namespace std;

int cmmdc(int a, int b)
{
    int c;
    while (b)
    {
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}

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