#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<sstream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<climits>
#include<cmath>
#include<string>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<numeric>
#include<functional>
#include<algorithm>
#include<bitset>
#include<tuple>
#include<unordered_set>
#include<unordered_map>
#include<random>
#include<array>
#include<cassert>
using namespace std;
#define INF ((1<<30)-1)
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(v) v.begin(),v.end()

#define MOD 998244353



int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	long long n;
	int s;

	cin >> n >> s;
	int p[20];

	long long f = 1;
	rep(i, s)f *= i + 1;

	vector<int> rem;
	rep(i, s) rem.push_back(i + 1);

	rep(i, s) {
		f /= s - i;
		int ord = n / f;
		p[i] = rem[ord];
		rem.erase(rem.begin() + ord);
		n %= f;
	}

	int inv[20];
	rep(i, s)inv[p[i] - 1] = i + 1;

	f = 1;
	rep(i, s)f *= i + 1;
	rep(i, s) rem.push_back(i + 1);

	long long ans = 0;
	rep(i, s) {
		f /= s - i;
		int ord = lower_bound(all(rem), inv[i]) - rem.begin();
		ans += f * ord;
		rem.erase(rem.begin() + ord);
	}

	cout << ans << endl;

	return 0;
}