Gx, Gy = map(int, input().split())

if Gx == 0 or Gy == 0:
    rook_moves = 1
elif Gx == 0 and Gy == 0:
    rook_moves = 0
else:
	rook_moves = 2

if (Gx + Gy) % 2 != 0:
    bishop_moves = float('inf')
else:
    if Gx == Gy or Gx == -Gy:
        bishop_moves = 1
    elif Gx == 0 or Gx == 0:
    	bishop_moves = 0
    else:
        bishop_moves = 2

print(min(rook_moves, bishop_moves))