import java.util.*; 
import java.io.*; 

public class Main {
	public static void main(String[] args) throws IOException {
       Scanner sc = new Scanner(System.in);
       int n = sc.nextInt(); 
       String str = Integer.toString(n); 
       int k = sc.nextInt(); 
       String convert = Integer.toString(Integer.parseInt(str,10),k); 
       System.out.println(convert.length());
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz