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

int main(){

    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll A,B,C,D;
    cin>>A>>B>>C>>D;
    if(A>0&&B>0){
        cout<<min(C/A,D/B)<<endl;
    }
    else if(A>0){
        cout<<C/A<<endl;
    }
    else cout<<D/B<<endl;
    
}