#include <stdio.h>
#include <iostream.h>
int main()
{
freopen("fractii.in","r",stdin);
freopen("fractii.out","w",stdin);

long x,q,p,n;
cin>>n;
x=0;
for (p=1;p<=n;p++)
	{for(q=1;q<=n;q++)
		if (p%q!=0) {x=x+1; cout<<p<<"/"<<q<<" ";}
		if (q%p!=0) {x=x+1; cout<<q<<"/"<<p<<" ";}
                 }
cout<<x;
return 0;
}