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

# Rook logic
if Gx == 0 or Gy == 0:
    rook_moves = 1 if (Gx, Gy) != (0, 0) else 0
else:
    rook_moves = 2

# Bishop logic
if (Gx + Gy) % 2 != 0:
    bishop_moves = float('inf')  # Impossible to reach
elif (Gx, Gy) == (0, 0):
    bishop_moves = 0
elif abs(Gx) == abs(Gy):
    bishop_moves = 1
else:
    bishop_moves = 2

# Final answer
print(min(rook_moves, bishop_moves))