#include <iostream>
#include <fstream>
using namespace std;
int verificare(int i, int j)
{
    int d=2,maxx;
    if(j<=i) maxx=j;
    else maxx=i;
    if(d>maxx) return 1;
    if(i==j) return 0;
    else
    {
        for(d=2;d<=maxx;d++)
        {
            if(i%d!=0 || j%d!=0) return 1;
        }
    }
    return 0;
}
int main()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    int i,j,n,s;
    in>>n;
    s=n;
    for(i=2;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(verificare(i,j)==1) s++;
        }
    }
    out<<s;
    return 0;
}