#include <bits/stdc++.h>
using namespace std;
#define REP(i,N) for(i=0;i<N;i++)
typedef long long ll;
typedef pair<int, int> P;
typedef struct{
  int first;
  int second;
  int third;
}T;

//昇順
bool comp_Se(T& l, T& r){
  return l.second < r.second;
}

int main(void){
  int A,B,C,D;
  cin >> A >> B >> C >> D;
  int num = max(D/(C+1),A);
  if(num*C > B)num = B/C;
  cout << num << endl;
  return 0;
}