import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int sum=0;
         for(int i=1;i<=n;i++){
             if(i==1){
                 if(n%5==0){
                     sum+=i+2;
                 }
             }else if((i+1)%5==0){
                 //System.out.println(i);
                 sum+=i+2;
             }else{
                 sum+=i;
             }
             System.out.println(sum+" "+i);
         }
        System.out.println(sum);
    }
}