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

#define rep(i, n) for( ll i = 0; i < n; i++ )
using ll = long long;

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