s = 'ДЕРВО'
c = 0
for i in s:
    for j in s:
        for k in s:
            for q in s:
                for w in s:
                    for r in s:
                        word = i + j + k + q + w + r
                        if word[0] <= word[2] <= word[4] and word[1] <= word[3] <= word[5]:
                            c += 1
print(c)