#include<bits/stdc++.h>
using namespace std;
int yzh(int n){
	int r=0;
	for(int i=2;i<=sqrt(n);i++){
		if(n%i==0){
			if(i==n/i) r=r+i;
			else r=r+i+n/i;		
		}
	}
	return r;
}
	
int main(){
	int n;
	cin>>n;
	for(int i=2;i<=n;i++){
		for(int j=2;j<=n;j++){
			if(yzh(i)==j&&yzh(j)==i&&i!=j) cout<<i<<" "<<j<<endl;
		}
	}


	return 0;
}

/**************************************************************
	Problem: 1140
	User: wuzihang
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/