#include<bits/stdc++.h>
using namespace std;
int n,m,a,b,sum;
int main(){
	cin>>n>>m>>a>>b;
	while(1){
		if(n>m){
			n-=max(a,b);
			m-=min(a,b);
		}
		else{
			m-=max(a,b);
			n-=min(a,b);
		}
		sum++;
		if(n<0||m<0){
			sum--;
			break;
		}
	}
	cout<<sum;
	return 0;
}