#include <iostream>
#include <fstream>
using namespace std;
unsigned cmmdc(unsigned a, unsigned b)
{
unsigned r;
r=a%b;
while(r!=0)
{
a=b;
b=r;
r=a%b;
}
return b;}
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    unsigned n,i,j,nr;
    f>>n;
    nr=n;
    for(i=2;i<=n;i++)
        for(j=1;j<=n;j++)
            if(cmmdc(i,j)==1) nr++;
            g<<nr;


    return 0;
}