#include<iostream>
#include<fstream>
using namespace std;
int a[200],b[200],nr_k=0,nr_kk=0;

void permutari(int k, int len,int K)
{ 
    if(k-1 == len)
	{
		int ok=1;
		nr_k=0;
		for(int i = 2; i <= len; i++) 
		{
			for(int j=1;j<i&&ok==1;j++)
				if(a[j]>a[i])
					ok=0;
			if(ok==1)
				nr_k++;
			ok=1;
		}
		if(nr_k+1==K)
			nr_kk++;
    } 
    else
	{ 
        for(int  i = 1; i <= len; i++) 
            if(!b[i])
			{ 
                a[k] = i; 
                b[i] = 1; 
                permutari(k+1, len,K); 
                b[i] = 0; 
            } 
    }
} 

int main()
{
	int N,K;
	ifstream f_in("perm.in");
	ofstream f_out("perm.out");
	f_in>>N>>K;
	permutari(1,N,K);
	f_out<<nr_kk;
	return 0;
}