#include <iostream>
#include <cmath>
using namespace std;
int sum(int n){
	int s,i;
	s=0;
	for(i=2;i<=sqrt(n);i++){
		if(n%i==0){
			if(i==n/i){
				s=s+i;
			}else{
				s=s+i+n/i;
			}
		}
	}
	return s;
}
void shudui(int n){
	int i,s;
	for(i=2;i<=n;i++){
		s=sum(i);
		if(sum(s)==i&&i!=s&&s<=n){
			cout<<i<<" "<<s<<endl;
		}
	}
}
int main(){
	int n;
	cin>>n;
	shudui(n);
}
/**************************************************************
	Problem: 1140
	User: admin
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/