#include <iostream>
#include <fstream>
using namespace std;

bool cmmdc(int a, int b)
{
    int d;
        while(a!=b)
        {
            if(a>b)
                a=a-b;
            else
                b=b-a;
        }
        cout<<a<<endl;
        if(a==1)
            return true;
        else
            return false;
}

int main()
{
    ifstream fin("fractii.in");
    ofstream fou("fractii.out");

    int n,nr;
    fin>>n;
    nr=0;
    if(n>2)
    {
        for(int i=1;i<=n;++i)
        {
            for(int j=1;j<=n;++j)
            {
                if(cmmdc(i,j)==true)
                    {
                        cout<<i<<"/"<<j<<endl;
                        nr++;
                    }
            }
        }
    }
    cout<<nr;
    fou<<nr;
    return 0;
}