#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,i,j,s;
bool ired(int a,int b)
{
    int c;
    while (b)
    {
        c=a%b;
        a=b;
        b=c;
    }
    if(a==1)
    return true;
    else
        return false;
}
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=i;j++)
            if(ired(j,i)==true)
                {
                    if(i!=j)
                    s+=2;
                    else
                        s+=1;
                }
    }
    g<<s;
    return 0;
}