import java.util.*;
public class Main{
static int n;
public static void main(String[]args){
Scanner sc = new Scanner(System.in);
n = sc.nextInt();
System.out.println("0/1");
dfs(0,1,1,1);
System.out.println("1/1");
}
public static void dfs(int a,int b,int c,int d){
if(b+d>n) return;
dfs(a,b,a+c,b+d);
System.out.println(a+c+"/"+(b+d));
dfs(a+c,b+d,c,d);
}
}