#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int a,int b)
{
    while(b != 0){
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int nr_fractii(int n)
{
    int s=n;
    for(int i=2;i<=n;i++)
        for(int j=1;j<=n;j++)
            if(cmmdc(i,j)==1)
                s++;
    return s;
}
int main()
{
    int n;
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;
    g<<nr_fractii(n);
    f.close();
    g.close();
    return 0;
}