#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
long cmmdc(int a,int b)
{
    while(a!=0)
    {
        if(a>=b)
            a=a-b;
        else
            b=b-a;
    }
    return b;
}

int main()
{
long n,i,j,nr=0;
f>>n;
for(i=1;i<=n;i++)
    for(j=1;j<=n;j++)
{
    if(i==1 || j==1)
        nr++;
    else
        if(cmmdc(i,j)==1)
        nr++;
}
g<<nr;
    return 0;
}