#include <bits/stdc++.h>

using namespace std;
typedef long long int ll;
typedef pair<ll,ll> pll;
typedef vector<ll> vll;

#define repi(i,a,b) for(ll i=a;i<b;i++)
#define rep(i,a) repi(i,0,a)
#define rrep(i,a) for(ll i=a-1;i>=0;i--)
#define MOD 1000000007

//debug
#define debug(arr) cerr<<#arr<<"(l"<<__LINE__<<") : ";for(auto x:arr)cerr<<x<<" ";cerr<<endl;

int main(){
  ll A, B, C, D;
  cin >> A >> B >> C >> D;

  ll ans = 0;
  while (C >= 0 && D >= 0) {
    C -= A;
    D -= B;
    ans++;
  }
  cout << (ans-1) << endl;
  return 0;
}