#include<bits/stdc++.h>
using namespace std;
int f(int n){
	int sum=0;
	for(int i=2;i<n;i++){
		if(n%i==0){
			sum=sum+i+n/i;
		}
	}
	return sum/2;									
}
int main(){
	int n;
	cin>>n;
  	for(int i=1;i<=n;i++){
		if(f(i)!=0&&f(f(i))==i&&f(i)<=n){
			cout<<i<<" "<<f(i)<<endl;
		}
	}
	return 0;
}
/**************************************************************
	Problem: 1140
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/