#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)
#define all(a) (a).begin(),(a).end()

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    ll A, B, N, M;
    cin >> A >> B >> N >> M;
    
    ll ans = min(A, B);
    A -= ans;
    B -= ans;
    
    if (A > 0) ans += A / (N + 1);
    if (B > 0) ans += B / (M + 1);
    
    cout << ans << '\n';
}