#include <iostream>
#include<fstream>
using namespace std;
ifstream f ("fractii.in");
ofstream g ("fractii.out");
int n;
int divizor (int a, int b)
{
    if(b == 0)
        return a;
    else return divizor (b, a % b);
}
int main()
{int i,j,c,a1,b1;
    f>>n;
c=1;
for(i=1;i<=n;i++)
    for(j=1;j<=n;j++){if(i!=j){a1=i;b1=j;
   if (divizor(a1,b1)==1) c++;

                }}
    g<<c;

    return 0;
}