#include<iostream.h>
#include<fstream.h>
long cmmdc(long a,long b)
{if (b==0)
	return a;
else
	return cmmdc(b,a%b);
}
long n;
int main()
{ifstream fin("fractii.in");
  fin>>n;
 fin.close(); 
 ofstream fout("fractii.out");
 long i,j,nr;
 nr=0;
 for(i=1;i<=n;i++)
 {for(j=1;j<=n;j++)
	  if(cmmdc(i,j)==1)
		{ fout<<i<<'/'<<j<<",";
		  nr++;
        }
		fout<<'\n';
 }
 fout<<nr;
 fout.close();
 return 0;
}