Problem:
Score : 200 points

Problem Statement

There are N gems. The value of the i-th gem is V_i.

You will choose some of these gems, possibly all or none, and get them.

However, you need to pay a cost of C_i to get the i-th gem.

Let X be the sum of the values of the gems obtained, and Y be the sum of the costs paid.

Find the maximum possible value of X-Y.

Constraints

All values in input are integers.

1 \leq N \leq 20

1 \leq C_i, V_i \leq 50

Input

Input is given from Standard Input in the following format:

N
V_1 V_2 ... V_N
C_1 C_2 ... C_N

Output

Print the maximum possible value of X-Y.

Sample Input 1

3
10 2 5
6 3 4

Sample Output 1

5

If we choose the first and third gems, X = 10 + 5 = 15 and Y = 6 + 4 = 10.
We have X-Y = 5 here, which is the maximum possible value.

Sample Input 2

4
13 21 6 19
11 30 6 15

Sample Output 2

6

Sample Input 3

1
1
50

Sample Output 3

0

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Linq;
using System.Threading.Tasks;

static class Program
{
static void Main()
{
  int nGem = int.Parse(Console.ReadLine());
  var values = Console.ReadLine().Split(' ').Select(c => int.Parse(c)).ToArray();
  var costs = Console.ReadLine().Split(' ').Select(c => int.Parse(c)).ToArray();
  var pairs = Enumerable.Range(0, nGem).Select(idx =>
     new
     {
       Value = values[idx],
       Cost =  costs[idx],
       Balance =  values[idx] - costs[idx]
    });
  int result = pairs.Where(p => p.Balance > 0).Sum(p => p.Balance);
  Console.WriteLine(result);
}

}