import java.util.Scanner;
public class Main{
  public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
    long N = sc.nextInt();
    int K = sc.nextInt();
    int keta = 0;
    
    for(int i = 1; ; i++){
    	if(N < Math.pow(K, i)){
          keta = i;
          break;
        }
    }
    System.out.println(keta);
  }
}

/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