#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int cmmdc(int x, int y)
{
    if(x%2==0 && y%2==0)
    {
        return 2;
    }
    int r;
    while(y!=0)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;
}
int main()
{
    int n, i, j, cnt=0;
    fin>>n;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(cmmdc(i, j)==1)
            {
                cnt++;
            }
        }
    }
    fout<<cnt;
    return 0;
}