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

using ll = long long;
using llu = long long unsigned;
#define MOD 100000000

int main() {
    int a, b, c, d;
    cin >> a >> b >> c >> d;

    if (a == 0 || b == 0 || c == 0 || d == 0) { cout << 0 << endl; }
    else {
        cout << min(c/a, d/b) << endl;
    }
    return 0;
}