import java.util.Scanner;

/**
 * B - Digits
 * 整数 N を K 進数で表したとき、何桁になるかを求めてください。
 */
public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner( System.in );
        // 整数N
        int n = sc.nextInt();
        // 何進法か
        int k = sc.nextInt();

        if( k == 10 ) {
            System.out.println( String.valueOf( n ).length() );
        }
        else {
            String baseK = Integer.toString( n, k );
            System.out.println( String.valueOf( baseK ).length() );
        }

        sc.close();
    }
}
/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