#include <bits/stdc++.h>
using namespace std;

template<typename T>
void fin(T a){
  cout<<a<<endl;
  exit(0);
}
signed main(){
    int a,b,c,d;cin>>a>>b>>c>>d;
    for(int i=100;i>=0;i--){
        if(i<=a&&i*c<=b&&i*(c+1)<=d)fin(i);
    }
}