import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        long v = sc.nextLong();
        int length = sc.nextInt();
        int[] values = getArray(v, length);
        int[] nexts = new int[length];
        for (int i = 0; i < length; i++) {
            nexts[values[i]] = i;
        }
        System.out.println(getOrder(nexts));
    }
    
    static long getOrder(int[] arr) {
        ArrayList<Integer> list = new ArrayList<>();
        for (int i = 0; i < arr.length; i++) {
            list.add(i);
        }
        long ans = 0;
        for (int i = 0; i < arr.length; i++) {
            long tmp = proc(arr.length - i - 1);
            for (int j = 0; j < list.size(); j++) {
                if (list.get(j) == arr[i]) {
                    list.remove(j);
                    break;
                }
                ans += tmp;
            }
        }
        return ans;
    }
    
    static int[] getArray(long v, int length) {
        int[] ans = new int[length];
        ArrayList<Integer> list = new ArrayList<>();
        for (int i = 0; i < length; i++) {
            list.add(i);
        }
        for (int i = 0; i < length; i++) {
            long tmp = proc(length - i - 1);
            for (int j = 0; j < list.size(); j++) {
                if (tmp > v) {
                    ans[i] = list.remove(j);
                    break;
                }
                v -= tmp;
            }
        }
        return ans;
    }
    
    static long proc(int x) {
        if (x == 0) {
            return 1;
        } else {
            return x * proc(x - 1);
        }
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}