#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
long long int cmmdc(long long int a,long long int b)
{
    int r;
    while(b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    long long int a,b,n,nf=0;
    f>>n;
    for(a=1;a<=n;a++)
        for(b=1;b<=n;b++)
    {
        if(cmmdc(a,b)==1) nf++;
    }
    g<<nf;
    return 0;
}