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

    # Bishop
    if (gx + gy) % 2 != 0:
        bishop_moves = float('inf')  # 行けない
    elif gx == 0 and gy == 0:
        bishop_moves = 0
    elif abs(gx) == abs(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))