#include <iostream>

using namespace std;

int complect(int & b, int & a) {
  int com = min(a, b);
  a -= com;
  b -= com;
  return com;
}
int main() {
  int a1, a2, a3, b1, b2, b3, c; //c-все возможные комплекты
  cin >> a1 >> a2 >> a3 >> b1 >> b2 >> b3;
  c = 0;
  c += complect(a1, b1);
  c += complect(a2, b2);
  c += complect(b1, a3);
  c += complect(a1, b3);
  c += complect(a2, b3);
  c += complect(a3, b3);
  c += complect(b1, a3);
  c += complect(b2, a3);

  cout << c;
  return 0;
}