#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: chenmingyu
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/