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

#include <atcoder/all>
using namespace atcoder;

int main() {
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  if(a == 0) cout << d / b << endl;
  else if(b == 0) cout << c / a << endl;
  else cout << min(c / a, d / b) << endl;
}