# coding: utf-8
# Your code here!
import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline
read = sys.stdin.read

a,b = [int(i) for i in readline().split()]

if 2*a < b:
    print(0)
elif 2*a == b:
    print(4)
elif a < b:
    print(8)
elif a == b:
    print(4)
else:
    print(0)