#include <bits/stdc++.h>

using namespace std;
using ll = long long;

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

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