#include "bits/stdc++.h" using namespace std; typedef long long ll; void Say(bool say, string a = "Yes", string b = "No"){cout << (say ? a : b) << endl;}; int main(){ ll A, B, C, D; cin >> B >> A >> C >> D; ll ans = 0; for(ll i = 0; i <= B; i++){ if(C * i <= A && C * i + i <= D)ans = i; } cout << ans << endl; return 0; }