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)
{
}
else
{
System.
out.
print((x
+ y
+ z
) - (a
+ b
+ c
- n
)); }
}
}
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