#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){	
	
	int aw,ab,bw,bb;
	cin>>aw>>ab>>bw>>bb;
	
	int c,d;
	cin>>c>>d;
	
	if(ab>=c){
		ab -= c;
		bb += c;
	}
	else{
		bb += ab;
		c -= ab;
		ab = 0;
		aw -= c;
		bw += c;
	}
	
	cout<<aw + min(d,bw)<<endl;
	
	return 0;
	
}