Problem:
Score : 300 points

Problem Statement

To make it difficult to withdraw money, a certain bank allows its customers to withdraw only one of the following amounts in one operation:

1 yen (the currency of Japan)

6 yen, 6^2(=36) yen, 6^3(=216) yen, ...

9 yen, 9^2(=81) yen, 9^3(=729) yen, ...

At least how many operations are required to withdraw exactly N yen in total?

It is not allowed to re-deposit the money you withdrew.

Constraints

1 \leq N \leq 100000

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

If at least x operations are required to withdraw exactly N yen in total, print x.

Sample Input 1

127

Sample Output 1

4

By withdrawing 1 yen, 9 yen, 36(=6^2) yen and 81(=9^2) yen, we can withdraw 127 yen in four operations.

Sample Input 2

3

Sample Output 2

3

By withdrawing 1 yen three times, we can withdraw 3 yen in three operations.

Sample Input 3

44852

Sample Output 3

16

Solution in Python (3.4.3) (judge verdict: Accepted)

ans = [0] * 100100
ans[0] = 0

n = int(input())
#n = 127
for i in range(1,n+1):
    cand1 = ans[i-1]
    cand2 = 100001
    cand3 = 100001
    x = 6
    while (x<=i):
        cand2 = min(ans[i-x], cand2)
        x=6*x
    y = 9
    while (y<=i):
        cand3 = min(ans[i-y], cand3)
        y=9*y
    ans[i] = min(cand1,cand2,cand3) + 1


print(ans[n])