#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    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;

    return 0;
}