#include<fstream>
#include<iostream>
using namespace std;
//ifstream hin("fractii1.in");
//ofstream hout("fractii1.out");
int cmmdc(int a, int b)
{
    if(b==0)return a;
    return cmmdc(b, a%b);
}


int fractii(int n)
{
    int w=0;
    for(int i=2;i<=n;i++)
    {
        for(int j=2;j<=n;j++)
        {
            if(cmmdc(i,j)>1){w++;}
        }
    }
    return n*n-w;
}

main()
{
    int n;
    cin>>n;
    cout<<fractii(n);
}