CCC '15 J5 - π-day

//Ivan Li, Markville secondary school
import java.io.*;
import java.util.*;
public class ccc15j5{
 
  public static int memo[][] = new int[251][251];
 
  public static int solve(int n, int k){
    if(k<0||n<1) return 0;
    if(k==0) return 1;
    if(memo[n][k]!=0) return memo[n][k];
    return memo[n][k]=solve(n-1, k)+solve(n, k-n);
  }
 

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);

    int k  =sc.nextInt();
    int n = sc.nextInt();
 
    System.out.println(solve(n, k-n));

  }

}