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

    if (Gx + Gy) % 2 != 0:
        bishop_steps = float('inf')
    elif Gx == 0 and Gy == 0:
        bishop_steps = 0
    elif abs(Gx) == abs(Gy):
        bishop_steps = 1
    else:
        bishop_steps = 2

    return min(rook_steps, bishop_steps)
    
Gx, Gy = map(int, input().split())
min_moves(Gx, Gy)