#include <cmath>
#include <iostream>

int sumDiv(int x)
{
    int s = 0;
    for(int i = 1; i < x; ++i)
    {
        if(x % i == 0)
            s += i;
    }
    return s;
}

int main()
{ 
    for(int i = 1; i <= 2000; ++i)
    {
        int a = sumDiv(i);
        if(a == i)
            std::cout << i << std::endl;
    }  
}