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

int main() {
    int A, B, C, D;
    cin >> A >> B >> C >> D;
    if(A == 0) {
        if(0 < C) cout << 0 << endl;
        else cout << D/B << endl;
        return 0;
    }
    if(B == 0) {
        if(0 < D) cout << 0 << endl;
        else cout << C/A << endl;
        return 0;
    }
    cout << min(C/A, D/B) << endl;
    return 0;
}