#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	int Aw, Ab, Bw, Bb, C, D;
	cin >> Aw >> Ab >> Bw >> Bb >> C >> D;
	int cnt = min(C, Ab);
	Ab -= cnt;
	Bb += cnt;
	Aw -= C - cnt;
	Bw += C - cnt;
	Aw += min(D, Bw);
	cout << Aw << endl;
}