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

int solve(int A, int B, int C, int D){
    // x <= A
    // C * x <= B
    // (1 + C) * x <= D
    return min({A, B/C, D/(1 + C)});
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int A, B, C, D;
    cin >> A >> B >> C >> D;
    cout << solve(A, B, C, D) << endl;
    return 0;
}