#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;

    int ret = 0;
    for (int i=0; i<2000; ++i) {
        if (a*i > c || b*i > d) { ret = i; break; }
    }
    cout << ret << endl;
    return 0;
}