#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int a,b,c,d,e,f;
  cin>>a>>b>>c>>d>>e>>f;
  if(b >= e){
      d += e;
      b -= e;
  }
  else{
     e -= b;
     d += b;
     b = 0;
     a -= e;
     c += e;
  }
  cout<<a+min(c,f)<<endl;
}