//#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
//using namespace atcoder;
using ll = long long;
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
using Graph = vector<vector<ll>>;

int main() {
	 
	ll A,B,C,D,E,F;
	cin>>A>>B>>C>>D>>E>>F;
	if(B>=E){
		B-=E;
		D+=E;
	}
	else{
		A-=(E-B);
		C+=(E-B);
		B=0;
		D+=B;
	}

	if(C>=F){
		C-=F;
		A+=F;
	}
	else{
		A+=C;
	}
	cout<<A<<endl;




}