def min_moves_to_goal(gx: int, gy: int) -> int:
    # Rook hand count
    rook_moves = 1 if gx == 0 or gy == 0 else 2

    # Bishop: same color check
    if (gx + gy) % 2 != 0:
        bishop_moves = float('inf')  # bishop cannot reach
    elif gx == gy or gx == -gy:
        bishop_moves = 1
    else:
        bishop_moves = 2

    return min(rook_moves, bishop_moves)

# 入力
gx, gy = map(int, input().split())
print(min_moves_to_goal(gx, gy))