#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>
#include <queue>
#include <stack>
#include <unordered_set>
#include <unordered_map>

using namespace std;

typedef long long int ll;
typedef pair<int, int> Pii;

const ll mod = 998244353;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  int a, b, c, d;
  cin >> a >> b >> c >> d;

  int ans;
  if (a == 0) {
    ans = d / b;
  }
  else if (b == 0) {
    ans = c / a;
  }
  else {
    ans = min(c / a, d / b);
  }

  cout << ans << endl;

  return 0;
}