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 Kotlin (1.0.0) (judge verdict: Wrong Answer)

import java.lang.Math.pow

fun main(args: Array<String>) {
    val (N, K) = readLine()!!.split(' ').map(String::toDouble)

    for(d in 1..30) {
        if(     pow(K,  d   .toDouble()) < N &&
           N <= pow(K, (d+1).toDouble())) {
            println(d+1)
            break
        }
    }
}