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

int main()
{ f>>n;
g<<n*n-numar(n);



    return 0;
}