#include <iostream>
#include <fstream>

using namespace std;

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

int num(int a,int b)
{
    while(a!=b)
    {
        if(a>b)
            a=a-b;
        else
            b=b-a;
    }
    return a;
}
int main()
{
    int n,k,i,j;
    //while(fin>>n)
    //{
    fin>>n;
        k=0;
        k=n*2-1;
        for(i=2;i<=n;i++)
            for(j=2;j<=n;j++)
                if(num(i,j)==1)
                    k++;
        fout<<k<<'\n';
   // }
    return 0;
}