j = -1
i = 0
for k in range(256):
    for w in range(256):
        if i == 256:
            j = 1
            macierz[k][w] = 254
        else:
            macierz[k][w] = i
        if j == 1:
            i -= 2
        else:
            i += 2
    i = 0
    j = -1