#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

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