#include <iostream>

using namespace std;
int cmmdc (int a, int b)
{
    while (a!=b)
    {
        if (a>b) a-=b;
        else b-=a;
    }
    return a;
}

int main()
{int nr=0,n,i,j;
    cin>>n;
    for (i=1; i<=n; i++)
    {
        for (j=1; j<=n; j++)
            if(cmmdc(i,j)==1) {cout<<i<<"/"<<j<<endl; nr++;}

    }
    cout<<nr;

}