import java.util.Scanner;

public class Main{
    public static void main(String[]args){
        Scanner scan = new Scanner(System.in);
        long n,k,con,tmp;
        n=scan.nextLong();
        k=scan.nextLong();
        con=0;
        tmp=1;
        while(tmp<=n){
            tmp*=k;
            con+=1;
        }
        System.out.println(con);
    }
}
/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