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

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