#include <bits/stdc++.h>
using namespace std;

#define BIT(x) (1ull << (x))
#define FOR(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define RFOR(i, a, b) for (int i = (int)(b) - 1; i >= (int)(a); i--)
#define RREP(i, n) RFOR(i, 0, n)
#define EACH(i, v) for (__typeof((v).begin()) i = (v).begin(); i != (v).end(); ++i)
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define UNIQ(v) do {sort(ALL(v)); (v).erase(unique(ALL(v)), (v).end());} while (0)
#define PB push_back
#define MP make_pair
#define SIZE(v) ((int)(v).size())
#define DEBUG(x) cout << #x << " = " << x << endl



int main()
{
	int aw, ab, bw, bb, c, d;
	scanf("%d %d %d %d %d %d", &aw, &ab, &bw, &bb, &c, &d);
	int w, b;
	
	b = min(ab, c);
	w = c - b;
	aw -= w;
	ab -= b;
	bw += w;
	bb += b;
	
	w = min(bw, d);
	b = d - w;
	aw += w;
	ab += b;
	
	printf("%d\n", aw);
}