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

if Gx == 0 or Gy == 0:
    rook_moves = 1
else:
	rook_moves = 2

if (Gx + Gy) % 2 != 0:
    bishop_moves = float('inf')
else:
    if Gx == Gy:
        bishop_moves = 1
    else:
        bishop_moves = 2

print(min(rook_moves, bishop_moves))