#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
#define int long long
using namespace std;
typedef long long ll;
typedef vector<vector<ll>> mat;
const int INF = 1e9;



signed main()
{
    ll N, K;

    cin >> N >> K;
    if (N % (K + 1) == 0) {
        cout << N / (K + 1) + 1 << endl;
    } else {
        cout << (N + K) / (K + 1) << endl;
    }
}