Module: (Python) Subroutines: Procedures and Functions - 2


Problem

7 /8


friendly numbers

Problem

Friendly Numbers -– are two natural numbers such that the sum of all divisors of one number (less than that number itself) is equal to the other number, and vice versa. Write a program that tests a pair of numbers for "friendliness". Use a function that calculates the sum of the divisors of a number.

Input: The input string contains two natural numbers.

Output: The program should output the word 'YES' if the received numbers – friendly, and the word 'NO' otherwise.

Examples
# Input Output
1 220 284 YES
2 1210 1092 NO

time 1000 ms
memory 256 Mb
Rules for program design and list of errors in automatic problem checking

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