#include<bits/stdc++.h>
using namespace std;
int n,m,a,b;
int main(){
	cin>>n>>m>>a>>b;
	if(n>m) swap(n,m);
	int ab=a+b;
	int jq=n/ab;
	int ans=jq*2;
	int xn=n-jq*ab,xm=m-jq*ab;
	cout<<ans+min(xn/a,xm/b);
	return 0;
}

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