#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9 + 10;
const ll INFL = 4e18;

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;
}