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: Wrong Answer)

import math
def f(n):
    if n<2:
        return 1
    else:
        return n * f(n-2)
N=int(input())

# 5,2で10, 10で10
# nについて5のカウント数をa, 2のカウント数をbとすると，min(a,b)がカウント数となる
if not N%2==0:
    print(0)
else:
    count5 = 0
    max_5 = int(math.log(N,5))
    for i in range(1,max_5+1):
        count5+=int(int(N/(5**i))/2)
    #print(min(count5,count2))
    count5 = 0 
    d = 5*2
    while int(N/d)>0:
        count5+=int(N/d)
        d = d*5

    print(count5)