Problem:
Score: 100 points

Problem Statement

Takahashi is solving quizzes. He has easily solved all but the last one.

The last quiz has three choices: 1, 2, and 3.

With his supernatural power, Takahashi has found out that the choices A and B are both wrong.

Print the correct choice for this problem.

Constraints

Each of the numbers A and B is 1, 2, or 3.

A and B are different.

Input

Input is given from Standard Input in the following format:

A
B

Output

Print the correct choice.

Sample Input 1

3
1

Sample Output 1

2

When we know 3 and 1 are both wrong, the correct choice is 2.

Sample Input 2

1
2

Sample Output 2

3

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

m=int(n)
e2=0
e5=0

while m>1:
    if m%5!=0 and m%2!=0:
        continue
    m2=m
    m5=m
    while m2%2==0:
        e2=e2+1
        m2=m2/2
    while m5%5==0:
        e5=e5+1
        m5=m5/5
    m=m-2

print(min(e2,e5))