#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;


int main(){
  ll Aw, Ab, Bw, Bb, C, D;
  cin >> Aw >> Ab;
  cin >> Bw >> Bb;
  cin >> C >> D;
  
  ll b = min(Ab, C);
  ll w = C-b;
  Ab -= b;
  Aw -= w;
  Bb += b;
  Bw += w;

  w = min(Bw, D);

  cout << Aw + w << endl;
  
  return 0;
}