Volumes > Functions > problem:

030. 50576 - Number of Perfect numbers

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• 002. 50428 - Three Times
• 003. 50432 - Numbers and Squares
• 004. 50433 - Sum of Cubes
• 005. 50595 - Sum of the numbers
• 010. 50582 - Number of digits
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• 020. 50575 - Number of Prime num...
• 030. 50576 - Number of Perfect ...
• 035. 50467 - Random Numbers
• 040. 50354 - Intersecting Rectangles
• 050. 50510 - What floor are they?
• 050. 50566 - Grade Point Average (...
• 060. 50727 - Fibonacci Numbers
• 061. 50733 - The Highest Average
• 062. 50390 - Total Salary Paid
• 066. 50523 - Total Tax to Pay

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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).

Input I	Output 1
5 30	2

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