Number is called perfect if it equals the sum of all its divisors smaller than himself. Want to find all the perfect numbers from M to N.
In the first row are separated by a space of M and N.
M и N целые; 1 ≤ M ≤ N ≤ 10^9; (N - M)·Sqrt(N) ≤ 10^7.
In each row to derive one number in ascending order. If the perfect numbers in the interval not to withdraw "Absent".