#include <iostream>
#include <cmath>

using namespace std;

int main(){
    long long blue, yel;
    cin>>yel>>blue;
    long long x,y,z;
    cin>>x>>y>>z;

    yel-=x*2;
    yel-=y;
    blue-=y;

    blue-=z*3;

    unsigned long long ans=0;

    if(blue<0){
        ans+=abs(blue);
    }

    if(yel<0){
        ans+=abs(yel);
    }

    cout<<ans;
}