#include "bits/stdc++.h"
using namespace std;

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using vi = vector<int>;
using vl = vector<ll>;
ld EPS = 1e-12;
int INF = numeric_limits<int>::max() / 2;
int MOD = 1e9 + 7;
#define rep(i,n) for(int i = 0; i < n; i++)
#define all(obj) (obj).begin(), (obj).end()
#define debug(x) cerr << #x << ": " << x << '\n'
 
int main(){
    int a,b,c,d;
    cin >> a >> b >> c >> d;
    int ans = min(a, b/c);
    ans = min(ans, d/(c+1));
    cout << ans << endl;
    return 0;
}