#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    int a,b,c,d,e,f;
    cin >> a >> b >> c >> d >> e >> f;

    int tmp = min(b, e);
    b -= tmp;
    e -= tmp;
    d += tmp;
    a -= e;
    c += e;

    a += min(c, f);
    cout << a << endl;
    return 0;
}