#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

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
  {
    int ans = min(c / a, d / b);
    cout << ans << endl;
  }
}