Problem:
Score : 200 points

Problem Statement

Given is an integer N. Find the number of digits that N has in base K.

Notes

For information on base-K representation, see Positional notation - Wikipedia.

Constraints

All values in input are integers.

1 \leq N \leq 10^9

2 \leq K \leq 10

Input

Input is given from Standard Input in the following format:

N K

Output

Print the number of digits that N has in base K.

Sample Input 1

11 2

Sample Output 1

4

In binary, 11 is represented as 1011.

Sample Input 2

1010101 10

Sample Output 2

7

Sample Input 3

314159265 3

Sample Output 3

18

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

NandK = input()
NandK = NandK.split(' ')
N = int(NandK[0])
K = int(NandK[1])
ans = []
while (N / K) >= K:
    ans.append(N % K)
    N = int(N / K)
if len(ans) != 0:
    print(len(ans) + 2)
else:
    print(len(ans) + 1)