import java.util.*;
import java.lang.*;

class Main
{
	public static void main (String[] args)
	{
		Scanner input = new Scanner(System.in);
		int n = input.nextInt();
		int a = input.nextInt();
		int b = input.nextInt();
		int c = input.nextInt();
		int x = input.nextInt();
		int y = input.nextInt();
		int z = input.nextInt();
		if (x + y + z == 0)
		{
    		System.out.print(0);
    	}
    	else
    	{
    		System.out.print((x + y + z) - (a + b + c - n));
    	}
		
	}
}