#include<fstream>   
using namespace std;   
int main()   
{   
    ifstream in("fractii.in");   
    ofstream out("fractii.out");   
    int n,i,j,x,ok,l=0;   
    in>>n;   
    for (i=2;i<=n;i++)   
        for (j=2;j<=n;j++)   
        {ok=0;   
            for (x=2;x<=j;x++)   
            if (i%x==0 && j%x==0) ok++;   
        if (ok==0) l++;}   
        out<<l+n+n-1;   
        in.close();   
        out.close();   
        return 0;   
}