#include <fstream>
using namespace std;
int main()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    int i,j,n,rest,max=0,a,b;
    in>>n;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if((i%2==0)&&(j%2==0))
                break();
            else
            if(j==1)
                max=max+1;
            else
            {
                a=i;
                b=j;
                while (b != 0)
                {
                    rest = b;
                    b =  a % b;
                    a = rest;
                    }
                if (a == 1)
                    max=max+1;
                }
            }
        }
        out<<max;
}