#include <bits/stdc++.h>

using namespace std;

int main() {
    int a, b, c, d, ans = 0;
    
    cin >> a >> b >> c >> d;
    
    int prev = 0;
    for (int i = 0; i < a; i++) {
        ans++;
        if ((i + 1) * c > b || ans * (c + 1) > d) {
            cout << ans - 1 << endl;
            return 0;
        }
    }
    
    cout << ans << endl;

    return 0;
}