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

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

ANS=1<<60
for i in range(min(A,B)+1):
    natural=i
    unnatural=A-i

    rA=B-i
    rB=i

    natural+=rB
    unnatural+=rA

    ANS=min(ANS,abs(natural-unnatural))

print(ANS)