import java.util.*;

public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int d = sc.nextInt();

    int ans = 0;
    int cnt = 0;
    for (int i = 0; i < n; i++) {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    }

    if (cnt > 0) ans++;
    
    System.out.println(ans);
  }
} import java.util.*; util.* java public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int d = sc.nextInt();

    int ans = 0;
    int cnt = 0;
    for (int i = 0; i < n; i++) {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    }

    if (cnt > 0) ans++;
    
    System.out.println(ans);
  }
} Main public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int d = sc.nextInt();

    int ans = 0;
    int cnt = 0;
    for (int i = 0; i < n; i++) {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    }

    if (cnt > 0) ans++;
    
    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int d = sc.nextInt();

    int ans = 0;
    int cnt = 0;
    for (int i = 0; i < n; i++) {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    }

    if (cnt > 0) ans++;
    
    System.out.println(ans);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int d = sc.nextInt(); d sc.nextInt() sc.nextInt sc int ans = 0; ans 0 int cnt = 0; cnt 0 for (int i = 0; i < n; i++) {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    } {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    } cnt++ cnt if (cnt == d + 1) {
        ans++;
        cnt = -d;
      } cnt == d + 1 cnt d + 1 d 1 {
        ans++;
        cnt = -d;
      } ans++ ans cnt = -d cnt -d d if (cnt > 0) ans++; cnt > 0 cnt 0 ans++ ans System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int d = sc.nextInt();

    int ans = 0;
    int cnt = 0;
    for (int i = 0; i < n; i++) {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    }

    if (cnt > 0) ans++;
    
    System.out.println(ans);
  }
} public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int d = sc.nextInt();

    int ans = 0;
    int cnt = 0;
    for (int i = 0; i < n; i++) {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    }

    if (cnt > 0) ans++;
    
    System.out.println(ans);
  }
} Main
import java.util.*;

public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int d = sc.nextInt();

    int ans = 0;
    int cnt = 0;
    for (int i = 0; i < n; i++) {
      cnt++;
      if (cnt == d + 1) {
        ans++;
        cnt = -d;
      }
    }

    if (cnt > 0) ans++;
    
    System.out.println(ans);
  }
}
