sum.py

from itertools import product
from functools import reduce

class Number():
	def __init__(self):
		self.num = 0

	def succ(self):
		self.num += 1
		return self

	def toInt(self):
		return self.num

res = reduce(lambda x, _: x.succ(), product(range(6 + 1), range(4 + 1), range(10)), Number())

print(res.toInt())