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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Prepared by Ibrahim Mesecan.
Number of Perfect numbers
Shqip
Perfect number is a number whose sum of divisors are equal to the number itself.
e.g. 6 is a perfect number because sum of its divisors is 1+2+3=6.
Read two numbers and find out how many perfect numbers are there between these numbers.
Input specification
There will be only two numbers in the input file which are between
1 < n < m ≤ 20000.
Output specification
Between the given numbers, show the number of perfect numbers,if there is any.
Otherwise print "No" (without double quotations).
Для отправки решений необходимо выполнить вход.
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