#include<iostream>
using namespace std;
long long n,k,f[15][205];
int main(){
	cin>>n>>k;
	for(int i=2;i<=n;i++){
		f[1][i]=1;
		f[i][i]=1;
		f[0][i]=1;
	}
	for(int i=2;i<=k;i++){
		for(int j=i;j<=n;j++){
			if(j>i)f[i][j]=f[i-1][j-1]+f[i][j-i];
			//cout<<f[i-1][j-1]<<" "<<f[i][j-i]<<" "<<i<<" "<<j<<endl;
			else f[i][j]=f[i-1][j-1];
		}
	}
	cout<<f[k][n];
}