#include <bits/stdc++.h>
using namespace std;
const double INF = 1e100;
const double EPS = 1e-9;
template <class T1>
void deb(T1 e1) {
  cout << e1 << endl;
}
template <class T1, class T2>
void deb(T1 e1, T2 e2) {
  cout << e1 << " " << e2 << endl;
}
template <class T1, class T2, class T3>
void deb(T1 e1, T2 e2, T3 e3) {
  cout << e1 << " " << e2 << " " << e3 << endl;
}
template <class T1, class T2, class T3, class T4>
void deb(T1 e1, T2 e2, T3 e3, T4 e4) {
  cout << e1 << " " << e2 << " " << e3 << " " << e4 << endl;
}
template <class T1, class T2, class T3, class T4, class T5>
void deb(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5) {
  cout << e1 << " " << e2 << " " << e3 << " " << e4 << " " << e5 << endl;
}
template <class T1, class T2, class T3, class T4, class T5, class T6>
void deb(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5, T6 e6) {
  cout << e1 << " " << e2 << " " << e3 << " " << e4 << " " << e5 << " " << e6
       << endl;
}
template <class T>
T gcd(const T a, const T b) {
  return (b ? gcd<T>(b, a % b) : a);
}
template <class T>
T lcm(const T a, const T b) {
  return (a / gcd<T>(a, b) * b);
}
struct node {
  long long x, y;
  node() {}
  node(long long x, long long y) : x(x), y(y) {}
  bool operator<(const node& p) const { return x < p.x; }
};
int main() {
  long long i, j, k, l, x, y, z, t, m, n, l1, l2, a, b;
  scanf("%lld %lld", &a, &b);
  scanf("%lld %lld %lld", &x, &y, &z);
  long long a1 = 0, b1 = 0;
  a1 = x * 2;
  a1 += (y);
  b1 = y;
  b1 += (3 * z);
  a = a1 - a;
  b = b1 - b;
  if (a < 0) a = 0;
  if (b < 0) b = 0;
  deb(a + b);
  return 0;
}
