#include <iostream>
#include<fstream>
#include<math.h>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int prim (int n)
{
    int i=2;
    while(i<sqrt(n))
    {
        if(n%i==0)return 0;
        i++;
    }
    return 1;
}
int main()
{
    int n,i,j,k,ok;
    in>>n;
    in.close();
    k=(2*n)-1;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
        {
            if(prim(j)==1)
            if((i%j!=0)&&(j%i!=0))
            {
                //cout<<i<<"/"<<j<<"\n";
                k++;
            }
        }
    out<<k;
    return 0;
}