import java.util.*;

class TwinPairs{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int e=0;
        if(n<4){
            Sysem.out.print("0");
            System.exit(0);
        }
        for(int i=3; i<n; i++){
            e=0;
            for(int j=2 ; j<i; j++){
                if(i%j==0 || (i+2)%j==0){
                    e=1;
                    break;
                }}
                if(e==1){
                    continue;
                }
                else{
                    System.out.println(i + " " + (i+2));
                }
                
        }
        
    }
}