#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int cmmdc(long long a,long long b)
{
    while(b!=0)
    {
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    long long  n,i,j,s=0;
    cin>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(cmmdc(i,j) == 1)
                s++;
    cout<<s;
}