import java.util.*;
public class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		long K = sc.nextLong();
		int ans = 1;
		while(N / K != 0){
			N /= K;
			ans++;
		}
		System.out.println(ans);
	}	
} import java.util.*; util.* java public class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		long K = sc.nextLong();
		int ans = 1;
		while(N / K != 0){
			N /= K;
			ans++;
		}
		System.out.println(ans);
	}	
} Main public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		long K = sc.nextLong();
		int ans = 1;
		while(N / K != 0){
			N /= K;
			ans++;
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		long K = sc.nextLong();
		int ans = 1;
		while(N / K != 0){
			N /= K;
			ans++;
		}
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long N = sc.nextLong(); N sc.nextLong() sc.nextLong sc long K = sc.nextLong(); K sc.nextLong() sc.nextLong sc int ans = 1; ans 1 while(N / K != 0){
			N /= K;
			ans++;
		} N / K != 0 N / K N K 0 {
			N /= K;
			ans++;
		} N /= K N K ans++ ans System.out.println(ans) System.out.println System.out System System.out ans String args[] args public class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		long K = sc.nextLong();
		int ans = 1;
		while(N / K != 0){
			N /= K;
			ans++;
		}
		System.out.println(ans);
	}	
} public class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		long K = sc.nextLong();
		int ans = 1;
		while(N / K != 0){
			N /= K;
			ans++;
		}
		System.out.println(ans);
	}	
} Main
import java.util.*;
public class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		long K = sc.nextLong();
		int ans = 1;
		while(N / K != 0){
			N /= K;
			ans++;
		}
		System.out.println(ans);
	}	
}