Problem:
Score : 100 points

Problem Statement

You are given positive integers A and B.

If A is a divisor of B, print A + B; otherwise, print B - A.

Constraints

All values in input are integers.

1 \leq A \leq B \leq 20

Input

Input is given from Standard Input in the following format:

A B

Output

If A is a divisor of B, print A + B; otherwise, print B - A.

Sample Input 1

4 12

Sample Output 1

16

As 4 is a divisor of 12, 4 + 12 = 16 should be printed.

Sample Input 2

8 20

Sample Output 2

12

Sample Input 3

1 1

Sample Output 3

2

1 is a divisor of 1.

Solution in Python (3.4.3) (judge verdict: Runtime Error)

import collections
N = int(input())
mli = sorted(list(map(int,input().split())), reverse = False)
hp_min = mli[0]
index = 1
for i in range(1,N):
  if mli[index] % hp_min == 0:
    mli.pop(index)
  else:
    mli[index] = mli[index] % hp_min
    hp_min = mli[index]
    index += 1
    
#if mli[i] % hp_min != 0:
  #hp_min = mli[i] % hp_min 
print(hp_min)