#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000

long long frac(long long n){
	long long ret = 1;
	rep(i,n)ret *= i+1;
	return ret;
}

int main(){
	
	long long N,S;
	cin>>N>>S;
	
	vector<int> x(S);
	
	rep(i,x.size())x[i] = i;
	vector<int> y;
	
	while(x.size()!=0){
		long long z = frac(x.size()-1);
		y.push_back(x[N/z]);
		x.erase(x.begin()+(N/z));
		N %= z;
	}
	x.resize(S);
	rep(i,S){
		x[y[i]] = i;
	}
	
	rep(i,S)y[i] = i;
	long long ans = 0LL;
	
	rep(i,S){
		long long z = frac(y.size()-1);
		rep(j,y.size()){
			if(y[j]==x[i]){
				y.erase(y.begin()+j);
				break;
			}
			ans += z;
		}
	}
	
	cout<<ans<<endl;
	
    return 0;
}