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)

n1 = int(input())
n2 = int(input())
 
print(n1)
print(n2)
 
if n1 == 1:
  if n2 == 2:
    print("3")
  else:
    print("2")
else n1 == 2:
  if n2 == 1:
    print("3")
  else:
    print("1")
else n1 ==3:
  if n2 == 1:
    print("2"):
  else:
    print("1"):