import java.util.*;
import java.util.stream.Stream;
import java.util.stream.IntStream;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String[] sa = sc.nextLine().split(" ");
    int[] i = Stream.of(sa).mapToInt(Integer::parseInt).toArray();
    List<Integer> list = new ArrayList<>();
    list.add(i[0]);
    list.add( i[1] / i[2] );
    list.add( i[3] / (1 + i[2]) );
    Optional<Integer> min = list.stream().min((a, b) -> a.compareTo(b));
    System.out.println(min.get());
  }
}