source_code: import java.util.*;
  
  public class A912 {
  
  	public static void main(String[] args) {
  		// TODO Auto-generated method stub
  
  		Scanner scan = new Scanner(System.in);
  		
  		int A = scan.nextInt();
  		int B = scan.nextInt();
  		long x = scan.nextInt();
  		long y = scan.nextInt();
  		long z = scan.nextInt();
  		
  		long requiredA = x * 2 + y;
  		long requiredB = y + z * 3;
  		
  		long neededA = Math.max(0, requiredA - A);
  		long neededB = Math.max(0, requiredB - B);
  		System.out.print(neededA + neededB);
  	}
  
  }
  