#include<iostream>
#include<fstream>
using namespace std;
 unsigned char a[10000][10000]= {{0}}; //un Byte
int cmmdc(int a,int b)
{
    int r=a%b;
    while (r)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}
int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    int n;
    fin>>n;
    int ct=0;
   // unsigned char a[100][100]= {{0}}; //un Byte
    for (int i=1; i<=n; i++)
    {
        for (int j=1; j<=n; j++)
        {
            if (a[i][j]==0)
            {
              //  cout<<"i= "<<i<<endl;
                int k=1;
                if (cmmdc(i,j)==1)
                {
                    ct++;
                    a[i][j]=1;
                    int x=i;
                    int y=i;
                    while ((x<n)&&(y<n))
                    {
                        a[x][y]=1;
                        x=x*k;
                        y=y*k;
                        k++;
                    }
                }
            }
        }
    }
    fout<<ct;
}