#include <iostream>
#include <algorithm>
#include <climits>
using namespace std;

int main() {
    int g, b, G, B;
    cin >> g >> b >> G >> B;
    int max_g = (g == 0) ? INT_MAX : G / g;
    int max_b = (b == 0) ? INT_MAX : B / b;
    int max_s = min(max_g, max_b);

    cout << max_s << endl;
    return 0;
}