def min_moves(Gx, Gy):
    rook_moves = 0
    if Gx == 0 and Gy == 0:
        rook_moves = 0
    elif Gx == 0 or Gy == 0:
        rook_moves = 1
    else:
        rook_moves = 2

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

    return min(rook_moves, bishop_moves)

Gx = int(input())
Gy = int(input())
print(min_moves(Gx, Gy))