from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline

A,B = map(int,input().split())

if B>A:
    A,B = B,A

ans = A+B
for i in range(B+1):
    
    ans = min(ans,abs(A+B-4*i))
print(ans)