#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
typedef long long ll;

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