#include <algorithm>
#include <array>
#include <cmath>
#include <cstdio>
#include <deque>
#include <iomanip>
#include <iostream>
#include <numeric>
#include <optional>
#include <queue>
#include <sstream>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using namespace std;

int main() {
    uint64_t n, k;
    cin >> n >> k;
    uint64_t ans;
    if (n % (k + 1) == 0)
        ans = n / (k + 1) + 1;
    else
        ans = (n + (k + 1) - 1) / (k + 1);
    cout << ans << endl;
    return 0;
}