#include <iostream>
#include <fstream>

using namespace std;


int main()
{
    int i,j,n,c=0;
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    in>>n;
    c+=n;
    for(i=2;i<=n;i++)
        for(j=1;j<=n;j++)
            if(i%j&&j%i)
                c++;
            else
                if(j==1)
                    c++;
    out<<c;
    return 0;
}