Problem:
Score : 100 points

Problem Statement

You are given two integers A and B.
Find the largest value among A+B, A-B and A \times B.

Constraints

-1000 \leq A,B \leq 1000

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the largest value among A+B, A-B and A \times B.

Sample Input 1

3 1

Sample Output 1

4

3+1=4, 3-1=2 and 3 \times 1=3. The largest among them is 4.

Sample Input 2

4 -2

Sample Output 2

6

The largest is 4 - (-2) = 6.

Sample Input 3

0 0

Sample Output 3

0

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

N = int(input())
S = list(input())

reS = S[::-1]

wSum = [0 for i in range(N)]
eSum = [0 for i in range(N)]

for i in range(N):
    if i == 0:
        if S[i] == 'W':
            wSum[i] = 1
        if reS[i] == 'E':
            eSum[i] = 1
    else:
        if S[i] == 'W':
            wSum[i] = wSum[i-1] + 1
        else:
            wSum[i] = wSum[i-1]
        if reS[i] == 'E':
            eSum[i] = eSum[i-1] + 1
        else:
            eSum[i] = eSum[i-1]

eSum = eSum[::-1]

cost = eSum[1]

for i in range(1,N):
    if i == N - 1:
        if cost > wSum[N-2]:
            cost = wSum[N-2]
    else:
        if cost > wSum[i-1] + eSum[i+1]:
            cost = wSum[i-1] + eSum[i+1]
print(cost)