#include <iostream>
#include <fstream>
using namespace std;

ifstream f("fractii.in");
ofstream g("fractii.out");

int main()
{
    int i, j, n, fractii=0;
    cin>>n;

    fractii+=n;

    for(i=2;i<=n;i++)
    for(j=1;j<=n;j++){
            int ok=1;
        for(int k=2;k<j+i;k++)
            if(i%k==0 && j%k==0){
                ok=0;
                break;
            }
        if(ok) fractii++;
    }

    cout<<fractii;
}