using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Threading.Tasks;

namespace AtCorder
{
	public class Program
	{
		static void Main(string[] args)
		{
			var cin = new Scanner2();
			string n = cin.Next();
			int k = cin.Int();

			int m = n.Length;

			PascalTriangle.Initialize(101);

			int top = n[0] - '0';
			
			long ans = 0;
			if (k == 1) {
				ans += (m - 1) * 9;
				ans += top;
			} else if (k == 2) {
				if (m > 1) {
					int num = Math.Max(0, m - 2);
					for (int i = 0; i < num; i++) {
						ans += 9 * PascalTriangle.Combination(i + 1, 1) * 9;
					}

					ans += (top - 1) * PascalTriangle.Combination(m - 1, 1) * 9;
					int top2i = 1;
					for (int i = 1; i < m; i++) {
						if (n[i] != '0') {
							top2i = i;
							break;
						}
					}

					int top2 = n[top2i] - '0';
					ans += top2;
					if (m >= top2i + 1) {
						ans += PascalTriangle.Combination(m - top2i - 1, 1) * 9;
					}
				}
			} else {
				if (m > 2) {
					int num = Math.Max(0, m - 3);
					for (int i = 0; i < num; i++) {
						ans += 9 * PascalTriangle.Combination(i + 2, 2) * 81;
					}

					ans += (top - 1) * PascalTriangle.Combination(m - 1, 2) * 81;
					//topが最大固定
					int top2i = 1;
					for (int i = 1; i < m; i++) {
						if (n[i] != '0') {
							top2i = i;
							break;
						}
					}

					int top2 = n[top2i] - '0';

					if (m >= top2i + 1) {
						ans += (top2 - 1) * PascalTriangle.Combination(m - (top2i + 1), 1) * 9;
						if (m >= top2i + 2) {
							ans += PascalTriangle.Combination(m - (top2i + 2), 1) * 81;
						}

						int top3i = top2i + 1;
						for (int i = top2i + 1; i < m; i++) {
							if (n[i] != '0') {
								top3i = i;
								break;
							}
						}

						int top3 = n[top3i] - '0';
						ans += top3;
						if (m >= top3i + 1) {
							ans += (top3 - 1) * PascalTriangle.Combination(m - top3i - 1, 1) * 9;
							if (m >= top3i + 2) {
								ans += PascalTriangle.Combination(m - top3i - 2, 1) * 9;
							}
						}
					}
				}
			}

			Console.WriteLine(ans);
		}
	}
	public static class PascalTriangle
	{
		private static long[,] c_;
		public static void Initialize(int n)
		{
			c_ = new long[n + 1, n + 1];
			for (int i = 0; i <= n; i++) {
				for (int j = 0; j <= i; j++) {
					if (j == 0 || i == j) {
						c_[i, j] = 1;
					} else {
						c_[i, j] = (c_[i - 1, j - 1] + c_[i - 1, j]);
					}
				}
			}
		}

		public static long Combination(long n, long k)
		{
			if (n < k || (n < 0 || k < 0)) {
				return 0;
			}

			return c_[n, k];
		}
	}
	public class Scanner2
	{
		private readonly char[] delimiter_ = new char[] { ' ' };
		private readonly string filePath_;
		private readonly Func<string> reader_;
		private string[] buf_;
		private int index_;

		public Scanner2(string file = "")
		{
			if (string.IsNullOrWhiteSpace(file)) {
				reader_ = Console.ReadLine;
			} else {
				filePath_ = file;
				var fs = new StreamReader(file);
				reader_ = fs.ReadLine;
			}
			buf_ = new string[0];
			index_ = 0;
		}

		public string Next()
		{
			if (index_ < buf_.Length) {
				return buf_[index_++];
			}

			string st = reader_();
			while (st == "") {
				st = reader_();
			}

			buf_ = st.Split(delimiter_, StringSplitOptions.RemoveEmptyEntries);
			if (buf_.Length == 0) {
				return Next();
			}

			index_ = 0;
			return buf_[index_++];
		}

		public int Int() => int.Parse(Next());
		public long Long() => long.Parse(Next());
		public double Double() => double.Parse(Next());

		public int[] ArrayInt(int N, int add = 0)
		{
			int[] Array = new int[N];
			for (int i = 0; i < N; i++) {
				Array[i] = Int() + add;
			}
			return Array;
		}

		public long[] ArrayLong(int N, long add = 0)
		{
			long[] Array = new long[N];
			for (int i = 0; i < N; i++) {
				Array[i] = Long() + add;
			}
			return Array;
		}

		public double[] ArrayDouble(int N, double add = 0)
		{
			double[] Array = new double[N];
			for (int i = 0; i < N; i++) {
				Array[i] = Double() + add;
			}
			return Array;
		}

		public void Save(string text)
		{
			if (string.IsNullOrWhiteSpace(filePath_)) {
				return;
			}

			File.WriteAllText(filePath_ + "_output.txt", text);
		}
	}
}