#include <bits/stdc++.h> using namespace std; #define rep(i, m, n) for (int i = m; i < n; ++i) #define rem(i, m, n) for (int i = m; i >= n; --i) typedef long long ll; template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; } template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; } int main() { int a, b, c, d; cin >> a >> b >> c >> d; int ans = 0; rep(i, 0, a + 1) { int n = i * c; if(i + n <= d && n <= b) ans = i; else break; } cout << ans << endl; return 0; }