//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
using vi = vector<ll>;
using vd = vector<ld>;
using vP = vector<P>;
using vvi = vector<vector<ll>>;
using vvd = vector<vector<ld>>;
using vvP = vector<vector<P>>;
using vvvi = vector<vector<vector<ll>>>;
using vvvd = vector<vector<vector<ld>>>;
using vvvP = vector<vector<vector<P>>>;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using Mint = modint1000000007;
using vm = vector<mint>;
using vM = vector<Mint>;
using vvm = vector<vector<mint>>;
using vvM = vector<vector<Mint>>;
using vvvm = vector<vector<vector<mint>>>;
using vvvM = vector<vector<vector<Mint>>>;
#endif
#define rrep(i, n) for (ll i = (n)-1; (i) >= 0; --(i))
#define rep(i, n) for (ll i = 0; (i) < (n); ++(i))
#define reps(i, n) for (ll i = 1; (i) <= (n); ++(i))
#define Rep(i,a,b) for(ll i = (a); i <= (b); i++)
#define all(a) (a).begin(),(a).end()
const ll MOD = 998244353;
#define Yes(b) ((b)?"Yes":"No")
#define YES(b) ((b)?"YES":"NO")
#define ft first
#define sd second
bool chmin(ll& a, ll b) { return a > b ? a = b, 1 : 0; }
bool chmax(ll& a, ll b) { return a < b ? a = b, 1 : 0; }

signed main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    ll A, B, C, D; cin >> A >> B >> C >> D;
    if(A == 0) {A == 1, B = 4e18;}
    if(B == 0) {B == 1, A = 4e18;}
    ll ans = min(C / A, D / B);
    cout << ans << endl;
}