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

int prime(int a, int b)
    {int i,c;
        if(a<b){c=a;a=b;b=c;}
        for(i=2;i<=b;i++)
            {if(i%a==0 && i%b==0) return 1;}
            else return 0;
    }
int i,j,n,k;
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
            if(prime(i,j)==0) k++;
    }
    g<<k;
    return 0;
}