---

x = int(input())
y = int(input())
row1, pos1 = divmod(x - 1, 4)
row2, pos2 = divmod(y - 1, 4)

if row1 == row2:
    if abs(pos1 - pos2) == 1 and pos1 // 2 == pos2 // 2:
        print(1)
    elif pos1 + pos2 == 4:
        print(2)
    else:
        print(4)
else:
    if abs(row1 - row2) == 1 and pos1 // 2 == pos2 // 2:
        print(3)
    else:
        print(4)