#include<iostream>
#include<vector>
#include<string>
#include<sstream>
#include<functional>
#include<algorithm>
#include<map>
#include<queue>
#include<stack>
using namespace std;
int main() {
	long long a, b, n, m;
	cin >> a >> b >> n >> m;
	long long ans = min(a, b);
	a -= ans;
	b -= ans;
	ans += a / (n + 1);
	ans += b / (m + 1);
	cout << ans << endl;
}