from itertools import product

alphabet = '012345'

ap=[]

for i in product(alphabet, repeat=3):

if i[0] != '0' and int(i[0]) >= int(i[1]) >= int(i[2]):

ap.append(i)

print(len(ap))

n = 0

for i in range(1,6):

for j in range(0,6):

for k in range(0,6):

if i >= j and j >= k:

n=n+1

print(n)

k = 0

for i in range(5*6**2+5*6+5+1):

s = ''

x = i

while x:

s = str(x%6) + s

x = x//6

if len(s) == 3 and s[0] >= s[1] >= s[2]:

k+=1

print(k)

def quantity(previous,length):

if length==2:

return previous+1

return sum([quantity(x,length-1) for x in range(previous+1)])

print(sum([quantity(x,3) for x in range(1,6)]))