Buggy python submission (verdict: Runtime Error):
N=int(input())
number_of_withdrawal=[]

def floor(float_number):
    integer = 0
    while integer < float_number:
        integer+=1
    if integer == float_number:
        return integer
    else:
        integer-=1
        return integer

for money_6 in range(0, N+1):
    money_9 = N-money_6

    latest = count_6_pow_number+count_9_pow_number

    i=0
    count_6_pow_number=0
    while pow(6,i)<=money_6:
        count_6_pow_number += (floor(money_6/pow(6,i)))%6
        i+=1
    j=0
    count_9_pow_number=0
    while pow(9,j)<=money_9:
        count_9_pow_number += (floor(money_9/pow(9,j)))%9
        j+=1

    # print(money_6, money_9, sum(count_6_pow_number), sum(count_9_pow_number))
    number_of_withdrawal= count_6_pow_number+count_9_pow_number
    if number_of_withdrawal < latest:
        res = number_of_withdrawal


print(res)

Fixed submission:
import math

N=int(input())
number_of_withdrawal=[100000]

# def floor(float_number):
#     integer = 0
#     while integer < float_number:
#         integer+=1
#     if integer == float_number:
#         return integer
#     else:
#         integer-=1
#         return integer

for money_6 in range(0, N+1):
    money_9 = N-money_6

    i=0
    count_6_pow_number=0
    while pow(6,i)<=money_6:
        count_6_pow_number += (math.floor(money_6/pow(6,i)))%6
        i+=1
    j=0
    count_9_pow_number=0
    while pow(9,j)<=money_9:
        count_9_pow_number += (math.floor(money_9/pow(9,j)))%9
        j+=1

    # print(money_6, money_9, sum(count_6_pow_number), sum(count_9_pow_number))
    number_of_withdrawal.append(count_6_pow_number+count_9_pow_number)

print(min(number_of_withdrawal))

Buggy python submission (verdict: Time Limit Exceeded):

N=int(input())
number_of_withdrawal=[]

def floor(float_number):
    integer = 0
    while integer < float_number:
        integer+=1
    if integer == float_number:
        return integer
    else:
        integer-=1
        return integer

for money_6 in range(0, N+1):
    money_9 = N-money_6

    i=0
    count_6_pow_number=0
    while pow(6,i)<=money_6:
        count_6_pow_number += (floor(money_6/pow(6,i)))%6
        i+=1
    j=0
    count_9_pow_number=0
    while pow(9,j)<=money_9:
        count_9_pow_number += (floor(money_9/pow(9,j)))%9
        j+=1

    # print(money_6, money_9, sum(count_6_pow_number), sum(count_9_pow_number))
    number_of_withdrawal.append(count_6_pow_number+count_9_pow_number)


print(min(number_of_withdrawal))

Fixed submission:
import math

N=int(input())
number_of_withdrawal=[100000]

# def floor(float_number):
#     integer = 0
#     while integer < float_number:
#         integer+=1
#     if integer == float_number:
#         return integer
#     else:
#         integer-=1
#         return integer

for money_6 in range(0, N+1):
    money_9 = N-money_6

    i=0
    count_6_pow_number=0
    while pow(6,i)<=money_6:
        count_6_pow_number += (math.floor(money_6/pow(6,i)))%6
        i+=1
    j=0
    count_9_pow_number=0
    while pow(9,j)<=money_9:
        count_9_pow_number += (math.floor(money_9/pow(9,j)))%9
        j+=1

    # print(money_6, money_9, sum(count_6_pow_number), sum(count_9_pow_number))
    number_of_withdrawal.append(count_6_pow_number+count_9_pow_number)

print(min(number_of_withdrawal))

Buggy python submission (verdict: Time Limit Exceeded):
N=int(input())
number_of_withdrawal=[]

def floor(float_number):
    integer = 0
    while integer < float_number:
        integer+=1
    if integer == float_number:
        return integer
    else:
        integer-=1
        return integer

for money_6 in range(0, N+1):
    money_9 = N-money_6

    i=0
    count_6_pow_number=[]
    while pow(6,i)<=money_6:
        count_6_pow_number.append((floor(money_6/pow(6,i)))%6)
        i+=1
    j=0
    count_9_pow_number=[]
    while pow(9,j)<=money_9:
        count_9_pow_number.append((floor(money_9/pow(9,j)))%9)
        j+=1

    # print(money_6, money_9, sum(count_6_pow_number), sum(count_9_pow_number))
    number_of_withdrawal.append(sum(count_6_pow_number)+sum(count_9_pow_number))


print(min(number_of_withdrawal))

Fixed submission:
import math

N=int(input())
number_of_withdrawal=[100000]

# def floor(float_number):
#     integer = 0
#     while integer < float_number:
#         integer+=1
#     if integer == float_number:
#         return integer
#     else:
#         integer-=1
#         return integer

for money_6 in range(0, N+1):
    money_9 = N-money_6

    i=0
    count_6_pow_number=0
    while pow(6,i)<=money_6:
        count_6_pow_number += (math.floor(money_6/pow(6,i)))%6
        i+=1
    j=0
    count_9_pow_number=0
    while pow(9,j)<=money_9:
        count_9_pow_number += (math.floor(money_9/pow(9,j)))%9
        j+=1

    # print(money_6, money_9, sum(count_6_pow_number), sum(count_9_pow_number))
    number_of_withdrawal.append(count_6_pow_number+count_9_pow_number)

print(min(number_of_withdrawal))