import java.util.Scanner;

public class Main {

    public static final long MOD = 1000000007;

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String[] params = sc.nextLine().split(" " );
        long n = Long.parseLong( params[0] );
        int k = Integer.parseInt( params[1] );



        System.out.println( Long.toString( n , k ).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