#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
#define LONG_INF 8000000000000000000
long long n, k;
long long required(long long a) {
	if (a*(k + (long long)1) > n) return true;
	else return false;
}
int main(){
	cin >> n >> k;
	long long top = n;
	long long bot = 0;
	while (top - bot > 1) {
		long long mid = top + bot;
		mid /= 2;
		if (required(mid) == false) bot = mid;
		else top = mid;
	}
	if (required(bot)) {
		cout << bot << endl;
	}else 
	cout << top << endl;
	return 0;
}