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 C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>

int n,tmp,ans=10000 ;

int main(void){
    
    int i;
    int j;
    scanf("%d",&n);
    for(i=0;i<=n;i++){
        int sum=0;
        j=n-i;
         tmp=i;
        while(tmp){
            sum+=tmp%6;
            tmp/=6;
        }
        tmp=j;
        while(tmp){
            sum+=tmp%9;
            tmp/=9;
        }
        if(ans>sum)
            ans=sum;
            
    }
    printf("%d",ans);
}