#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");

int main()
{
    unsigned n,p,q,a,b,k=1,r;
    fin>>n;
    for(p=2;p<=n;p++)
    {
        for(q=1;q<=p;q++)
        {
            a=p;
            b=q;
            while(a!=b)
            {
                if(a>b)
                    a-=b;
                else
                    b-=a;
            }
            if(a==1)
                k+=2;
        }
    }
    fout<<k;
    return 0;
}