#include <iostream>
#include <fstream>

using namespace std;

ifstream f("fractii.in");
ofstream g("fractii.out");

int main()
{
    int i,j,n,fractii,k;
    bool found = false;

    f>>n;
    fractii = n*n;

    for (i=2;i<=n;i++)
    {
        for (j=2;j<=n;j++)
        {
            found = false;
            for (k=2;found==false && k<=n;k++)
            {
                if (i%k==0 && j%k==0)
                {
                    found = true;
                    fractii--;
                }
            }
        }
    }
    g<<fractii;
    return 0;
}