#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");

int cmmdc(int a,int b)
{
    while(b!=0)
    {
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    int n,cnt;
    fin>>n;
    cnt=2*n-1;

    for(int i=2;i<n;i++)
        for(int j=i+1;j<=n;j++)
        {
            if((i%2!=j%2)||(i%2==1&&j%2==1&&cmmdc(i,j)==1))
                cnt+=2;
        }
    fout<<cnt;

    return 0;
}