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


X=[1]+[6**i for i in range(1,7)]+[9**i for i in range(1,6)]
X.sort()
X.reverse()

ANS=1000000



i=6



for i_0 in range(max(N//X[0]-i,0),N//X[0]+1):
    N_0=N-X[0]*i_0
    for i_1 in range(max(N_0//X[1]-i,0),N_0//X[1]+1):
        N_1=N_0-X[1]*i_1
        for i_2 in range(max(N_1//X[2]-i,0),N_1//X[2]+1):
            N_2=N_1-X[2]*i_2
            for i_3 in range(max(N_2//X[3]-i,0),N_2//X[3]+1):
                N_3=N_2-X[3]*i_3
                for i_4 in range(max(N_3//X[4]-i,0),N_3//X[4]+1):
                    N_4=N_3-X[4]*i_4
                    for i_5 in range(max(N_4//X[5]-i,0),N_4//X[5]+1):
                        N_5=N_4-X[5]*i_5
                        for i_6 in range(max(N_5//X[6]-i,0),N_5//X[6]+1):
                            N_6=N_5-X[6]*i_6
                            for i_7 in range(max(N_6//X[7]-i,0),N_6//X[7]+1):
                                N_7=N_6-X[7]*i_7
                                for i_8 in range(max(N_7//X[8]-i,0),N_7//X[8]+1):
                                    N_8=N_7-X[8]*i_8
                                    for i_9 in range(max(N_8//X[9]-i,0),N_8//X[9]+1):
                                        N_9=N_8-X[9]*i_9
                                        i_10=N_9//6
                                        N_10=N_9-X[10]*i_10
                                        if ANS>i_0+i_1+i_2+i_3+i_4+i_5+i_6+i_7+i_8+i_9+i_10+N_10:
                                            ANS=i_0+i_1+i_2+i_3+i_4+i_5+i_6+i_7+i_8+i_9+i_10+N_10


                                            




print(ANS)
        
    


Fixed submission:
N=int(input())


X=[1]+[6**i for i in range(1,7)]+[9**i for i in range(1,6)]
X.sort()
X.reverse()

ANS=1000000







for i_0 in range(max(N//X[0]-3,0),N//X[0]+1):
    N_0=N-X[0]*i_0
    for i_1 in range(max(N_0//X[1]-3,0),N_0//X[1]+1):
        N_1=N_0-X[1]*i_1
        for i_2 in range(max(N_1//X[2]-3,0),N_1//X[2]+1):
            N_2=N_1-X[2]*i_2
            for i_3 in range(max(N_2//X[3]-3,0),N_2//X[3]+1):
                N_3=N_2-X[3]*i_3
                for i_4 in range(max(N_3//X[4]-3,0),N_3//X[4]+1):
                    N_4=N_3-X[4]*i_4
                    for i_5 in range(max(N_4//X[5]-3,0),N_4//X[5]+1):
                        N_5=N_4-X[5]*i_5
                        for i_6 in range(max(N_5//X[6]-3,0),N_5//X[6]+1):
                            N_6=N_5-X[6]*i_6
                            for i_7 in range(max(N_6//X[7]-3,0),N_6//X[7]+1):
                                N_7=N_6-X[7]*i_7
                                for i_8 in range(max(N_7//X[8]-3,0),N_7//X[8]+1):
                                    N_8=N_7-X[8]*i_8
                                    for i_9 in range(max(N_8//X[9]-3,0),N_8//X[9]+1):
                                        N_9=N_8-X[9]*i_9
                                        i_10=N_9//6
                                        N_10=N_9-X[10]*i_10
                                        if ANS>i_0+i_1+i_2+i_3+i_4+i_5+i_6+i_7+i_8+i_9+i_10+N_10:
                                            ANS=i_0+i_1+i_2+i_3+i_4+i_5+i_6+i_7+i_8+i_9+i_10+N_10


                                            




print(ANS)

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


X=[1]+[6**i for i in range(1,7)]+[9**i for i in range(1,6)]
X.sort()
X.reverse()

ANS=1000000



i=7



for i_0 in range(max(N//X[0]-i,0),N//X[0]+1):
    N_0=N-X[0]*i_0
    for i_1 in range(max(N_0//X[1]-i,0),N_0//X[1]+1):
        N_1=N_0-X[1]*i_1
        for i_2 in range(max(N_1//X[2]-i,0),N_1//X[2]+1):
            N_2=N_1-X[2]*i_2
            for i_3 in range(max(N_2//X[3]-i,0),N_2//X[3]+1):
                N_3=N_2-X[3]*i_3
                for i_4 in range(max(N_3//X[4]-i,0),N_3//X[4]+1):
                    N_4=N_3-X[4]*i_4
                    for i_5 in range(max(N_4//X[5]-i,0),N_4//X[5]+1):
                        N_5=N_4-X[5]*i_5
                        for i_6 in range(max(N_5//X[6]-i,0),N_5//X[6]+1):
                            N_6=N_5-X[6]*i_6
                            for i_7 in range(max(N_6//X[7]-i,0),N_6//X[7]+1):
                                N_7=N_6-X[7]*i_7
                                for i_8 in range(max(N_7//X[8]-i,0),N_7//X[8]+1):
                                    N_8=N_7-X[8]*i_8
                                    for i_9 in range(max(N_8//X[9]-i,0),N_8//X[9]+1):
                                        N_9=N_8-X[9]*i_9
                                        i_10=N_9//6
                                        N_10=N_9-X[10]*i_10
                                        if ANS>i_0+i_1+i_2+i_3+i_4+i_5+i_6+i_7+i_8+i_9+i_10+N_10:
                                            ANS=i_0+i_1+i_2+i_3+i_4+i_5+i_6+i_7+i_8+i_9+i_10+N_10


                                            




print(ANS)
        
    


Fixed submission:
N=int(input())


X=[1]+[6**i for i in range(1,7)]+[9**i for i in range(1,6)]
X.sort()
X.reverse()

ANS=1000000







for i_0 in range(max(N//X[0]-3,0),N//X[0]+1):
    N_0=N-X[0]*i_0
    for i_1 in range(max(N_0//X[1]-3,0),N_0//X[1]+1):
        N_1=N_0-X[1]*i_1
        for i_2 in range(max(N_1//X[2]-3,0),N_1//X[2]+1):
            N_2=N_1-X[2]*i_2
            for i_3 in range(max(N_2//X[3]-3,0),N_2//X[3]+1):
                N_3=N_2-X[3]*i_3
                for i_4 in range(max(N_3//X[4]-3,0),N_3//X[4]+1):
                    N_4=N_3-X[4]*i_4
                    for i_5 in range(max(N_4//X[5]-3,0),N_4//X[5]+1):
                        N_5=N_4-X[5]*i_5
                        for i_6 in range(max(N_5//X[6]-3,0),N_5//X[6]+1):
                            N_6=N_5-X[6]*i_6
                            for i_7 in range(max(N_6//X[7]-3,0),N_6//X[7]+1):
                                N_7=N_6-X[7]*i_7
                                for i_8 in range(max(N_7//X[8]-3,0),N_7//X[8]+1):
                                    N_8=N_7-X[8]*i_8
                                    for i_9 in range(max(N_8//X[9]-3,0),N_8//X[9]+1):
                                        N_9=N_8-X[9]*i_9
                                        i_10=N_9//6
                                        N_10=N_9-X[10]*i_10
                                        if ANS>i_0+i_1+i_2+i_3+i_4+i_5+i_6+i_7+i_8+i_9+i_10+N_10:
                                            ANS=i_0+i_1+i_2+i_3+i_4+i_5+i_6+i_7+i_8+i_9+i_10+N_10


                                            




print(ANS)