#include <iostream>
#include<fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int main()
{
    int n,i,j,k=0,g,ok;
    in>>n;
    in.close();
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
        {
            ok=1;
            for(g=2;g<=(i?j:i<j);g++)
                if(i%g==0&&j%g==0)
                    ok=0;
            if(ok==1)
            if(((i%j!=0)&&(j%i!=0))||j==1||i==1)
            {
                out<<i<<"/"<<j<<"\n";
                k++;
            }
        }
    cout<<k;
    return 0;
}