#include <iostream>
#include <cmath>

using namespace std;
const int N=11000;
bool st[N];

int yueshusum(int n)  
{
    int sum = 1;  //从1开始，否则for从1开始会加上数字本身
    for (int i = 2; i <= sqrt(n); i ++) //别写成n/2！！！
    {
        if (n % i == 0 && (n/i!=i))  
        {
            sum += i;  
            sum += n / i;  
        }
    }
    return sum;  
}

int main()
{
    for (int i = 1; i <= 10000; i ++)  
    {
        int x = yueshusum(i);  
        int y = yueshusum(x);  
        if (i == y && !st[x] && !st[y] && x!=y)
        {
            st[x]=true;
            st[y]=true;
            cout<<x<<" "<<y<<endl;
        }
    }
    return 0;
}