#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int main()
{
    long n,i,j,nr=0,a,b;
    fin>>n;
    for(i=2;i<=n;i++)
    {
        for(j=1;j<=i;j++)
        {
            if(i!=j)
            {
                a=i;
                b=j;
                while(a!=b)
                    if(a>b)a-=b;
                    else b-=a;
                if(a==1)nr++;
            }
        }
    }
    fout<<nr*2+1;
    return 0;
}