import math
import os
import random
import re
import sys
from math import gcd
from math import sqrt
from collections import Counter
a,b = list(map(int,input().split()))
x,y,z = list(map(int,input().split()))
p = max(0,2*x+y-a)
q = max(0,3*z+y-b)
print(p+q)#include<bits/stdc++.h>
using namespace std;
#define optimize() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int main()
{
optimize();
long long int a,b;
cin>>a>>b;
long long int x,y,z;
cin>>x>>y>>z;
long long int bl,ye;
ye=x*2;
ye+=y;
bl=y+z*3;
long long int c,d;
if(ye<=a)c=0;
else c=ye-a;
if(bl<=b)d=0;
else d=bl-b;
//cout<<c<<endl<<d<<endl;
cout<<c+d<<endl;
return 0;
}
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