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

if Gx == 0 and Gy == 0:
    print(0)
else:
    # Check Luke's moves
    luke_moves = 0
    if Gx == 0 or Gy == 0:
        luke_moves = 1
    else:
        luke_moves = 2
    
    # Check Bishop's moves
    bishop_moves = 0
    if (Gx + Gy) % 2 != 0:
        bishop_moves = float('inf')
    else:
        if abs(Gx) == abs(Gy):
            bishop_moves = 1
        else:
            bishop_moves = 2
    
    min_moves = min(luke_moves, bishop_moves)
    print(min_moves)