#include <iostream>
#include<fstream>
using namespace std;

int main()
{
    long int n;
    ifstream f("fractii.in");
    f>>n;
    f.close();
    int s,i,j,a,b,r;
    s=2*n-1;
    for(i=2;i<=n;i++)
        for(j=i+1;j<=n;j++)
        {a=i;b=j;
        r=a%b;
        while(r)
            {a=b;
            b=r;
            r=a%b;
            }
        if(b==1) s+=2;
        }
    ofstream g("fractii.out");
    g<<s;
    g.close();
}