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

int aw,ab,bw,bb,c,d;

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