#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("date.in");
ofstream fout("date.out");
int cmmdc(int a, int b)
{
   int r;
   while(b)
   {
       r=a%b;
       a=b;
       b=r;
   }
   return a;
}
int main()
{
    int n, nr=0;
    cin>>n;
    int p,q;
    for(int p=1; p<=n; p++)
        for(int q=1; q<=n; q++)
        {
            if(cmmdc(p,q)==1)
            {
                nr++;
                cout<<p<<"/"<<q<< " ";
            }
        }
    cout<<nr;
    return 0;
}