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

int main()
{
    int n, counter=0;
    fin>>n;
    int v[n][n];
    for(int i=1; i<=n; i++){
        for(int j=1; j<=n; j++){
            v[i][j]=0;
            if(i==j&&i>1){
                v[i][j]=1;
            }
            else{
                if((i<j&&i%j==0)||(i>j&&j%i==0)) v[i][j]=1;
            }
            if(v[i][j]==0){ 
                counter++;
                //cout<<i<<" "<<j<<endl;
            }
        }
    }
    fout<<counter;
    return 0;
}