#include <iostream>
#include <cstdio>
#include <iomanip>
#include <cmath>
#include <algorithm>
#include <cstring>
#include <string>
#include <stack>
#include <queue>
#define LL long long
using namespace std;
const int INF = 0x3f3f3f3f;
const int N = 1e5 + 10;

long long  n , k , dp[20][2032];

int main()
{
	cin >> n >> k;
	dp[0][0] = 1;
	for(int i = 1; i <= n; i++)
	{
		for(int j = k; j > 0; j--) 
		{
			for(int l = i; l <= n; l++)
			{
				dp[j][l] = dp[j][l] + dp[j - 1][l - i];
			 } 
		}
	}
	cout << dp[k][n];
 	return 0;
}