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 C (GCC 5.4.1) (judge verdict: Wrong Answer)

/*  ex3_3
    kosaq       */

#include <stdio.h>

int main(void){
    int number;    //the number of N
    int k_base;    //the number of K
    int i = 1;    //count how many times it looped

    scanf("%d" "%d", &number, &k_base);    //input N and K

    while(1){    //while(1) represents infinite loop
        i++;    //add 1 to i
        if(number < k_base) break;    //when it(number < k_base) occur, stop loop
    }

    printf("%d\n", i);    //output i
    return 0;
}